当a为和值时,直线（a-1）x+(3-a)y+a=0.在两坐标轴上的截距相等

一共 32 种组合,我写代码遍历了一下.所有组合如下：
1 + 2 + 6 + 10 + 11 = 30
1 + 2 + 7 + 9 + 11 = 30
1 + 2 + 8 + 9 + 10 = 30
1 + 3 + 5 + 10 + 11 = 30
1 + 3 + 6 + 9 + 11 = 30
1 + 3 + 7 + 8 + 11 = 30
1 + 3 + 7 + 9 + 10 = 30
1 + 4 + 5 + 9 + 11 = 30
1 + 4 + 6 + 8 + 11 = 30
1 + 4 + 6 + 9 + 10 = 30
1 + 4 + 7 + 8 + 10 = 30
1 + 5 + 6 + 7 + 11 = 30
1 + 5 + 6 + 8 + 10 = 30
1 + 5 + 7 + 8 + 9 = 30
2 + 3 + 4 + 10 + 11 = 30
2 + 3 + 5 + 9 + 11 = 30
2 + 3 + 6 + 8 + 11 = 30
2 + 3 + 6 + 9 + 10 = 30
2 + 3 + 7 + 8 + 10 = 30
2 + 4 + 5 + 8 + 11 = 30
2 + 4 + 5 + 9 + 10 = 30
2 + 4 + 6 + 7 + 11 = 30
2 + 4 + 6 + 8 + 10 = 30
2 + 4 + 7 + 8 + 9 = 30
2 + 5 + 6 + 7 + 10 = 30
2 + 5 + 6 + 8 + 9 = 30
3 + 4 + 5 + 7 + 11 = 30
3 + 4 + 5 + 8 + 10 = 30
3 + 4 + 6 + 7 + 10 = 30
3 + 4 + 6 + 8 + 9 = 30
3 + 5 + 6 + 7 + 9 = 30
4 + 5 + 6 + 7 + 8 = 30
对于 N = 29,也一共有 32 种组合,所有组合如下：
1 + 2 + 5 + 10 + 11 = 29
1 + 2 + 6 + 9 + 11 = 29
1 + 2 + 7 + 8 + 11 = 29
1 + 2 + 7 + 9 + 10 = 29
1 + 3 + 4 + 10 + 11 = 29
1 + 3 + 5 + 9 + 11 = 29
1 + 3 + 6 + 8 + 11 = 29
1 + 3 + 6 + 9 + 10 = 29
1 + 3 + 7 + 8 + 10 = 29
1 + 4 + 5 + 8 + 11 = 29
1 + 4 + 5 + 9 + 10 = 29
1 + 4 + 6 + 7 + 11 = 29
1 + 4 + 6 + 8 + 10 = 29
1 + 4 + 7 + 8 + 9 = 29
1 + 5 + 6 + 7 + 10 = 29
1 + 5 + 6 + 8 + 9 = 29
2 + 3 + 4 + 9 + 11 = 29
2 + 3 + 5 + 8 + 11 = 29
2 + 3 + 5 + 9 + 10 = 29
2 + 3 + 6 + 7 + 11 = 29
2 + 3 + 6 + 8 + 10 = 29
2 + 3 + 7 + 8 + 9 = 29
2 + 4 + 5 + 7 + 11 = 29
2 + 4 + 5 + 8 + 10 = 29
2 + 4 + 6 + 7 + 10 = 29
2 + 4 + 6 + 8 + 9 = 29
2 + 5 + 6 + 7 + 9 = 29
3 + 4 + 5 + 6 + 11 = 29
3 + 4 + 5 + 7 + 10 = 29
3 + 4 + 5 + 8 + 9 = 29
3 + 4 + 6 + 7 + 9 = 29
3 + 5 + 6 + 7 + 8 = 29
目前我没找到啥不用遍历的好方法,做一些简单的分类讨论虽然能节省一点计算,但仍然需要比较多的枚举.

x的平方-2（m+1）x+m的平方-3=0
△=4(m+1)²-4m²+12=8m+16>0
m>-2
当m>-2时,方程有两个不相等的实数根

（X-3)/5+X/4+3/2=0
X=-2

(a) y=(x+1)^0/√|x|-x
√|x|-x不等于0 x+1不等于0 计算得x<0且x不等于-1
√|x|-x>0 y=(x+1)^0/√|x|-x在定义域内等于y=1/√|x|-x 所以y>0
定义域x<0且x不等于-1 值域y>0
(b) y=1/1-√x-2
x-2>=0 x<=2
y=1-√x-2 √x-2>=0 y<=1
定义域x<2 值域y<=1

因为24 * 2 - 45 = 3,所以十字形的中间一定是3,
其他8个数字按照(1,5,6,9)和(2,4,7,8)分别排开就行,
比如：
2
4
1 5 3 6 9
7
8

4/6=2/3
原式=Y-2/3-KX-2/3=0
KX=Y-4/3
X=(Y-4/3)/K 因为分母不能为0
所以当K不等于0时方程有解

5分之（2X-2）=3分之2X-3的
等式两边同时乘以15得
3（2X-2）=5(2X-3)
6X-6=10X-15
4X=9
X=4分之9

根据方程
x²-(3k+1)x+2k²+2k=0
得判别式
Δ=b的平方-4ac,
Δ=[-(3k+1)]²-4×1×(2k²+2k)
=k²-2k+1
=(k-1)²≥0.
∴无论K为何值,方程x²-(3k+1)x+2k²+2k=0
总有实数根

代入 5=-k+b 1=k+b 所以k=-2 b=3 然后y=-2x+3≥0时 x小于等于1.5

3x-2y=2m+1
2x+y=5m-2
解得:
x=(12m-3)/7
yx>0
(12m-3)/7>0
m>1/4
y

=mod(sum(A1:D1),8)

用到从一个单元格里取数函数 mid() 用法是=mid(单元格地址,从第几个字符开始取数,取几位）；
求余数函数mod(),用法是=mod(单元格地址,除数）.
　=MOD((MID(A1,1,1)+MID(A1,2,1)+MID(A1,3,1))*(MID(A1,1,1)*1+1),3)*1-3

a^2+b^2-4a+6b+18
=（a-2）²+（b+3）²+5
当a=2,b=-3时,有最小值,最小值是5

极端数字
1+2+21+22=46
所以最极端的数字组合是 1,2,4,21,22
另外要保持50,对应一个加几一个减几就是了,注意不能重复
补充下 还有个极端组合是8,9,10,11,12.另外的组合同理
参考资料：http://www.***.com/bbs/dispbbs.asp?boardID=30&ID=1595&page=1

　　这个 很简单的哈.
y=x2-2x-1
　　转化为完全平方式 y=（x-1)2-2
　　然后函数图象你应该会的吧. 看图就知道
　　x=1时 ,y最小,最小值为-2
　　以后这种题目 都是这个程序做的、
第二小题,你也要看图哦.
　　然后你就比较m,m+1与对称轴的关系.
很简单的比较,你应该会的.
要分类讨论.
不过当m=0时,y1＞y2.
当m=1／2时,m与m+1对称,所以y1=y2.
当m＞1／2时,y1＜y2.
当m＜1／2时,y1＞y2.
嗯,最好自己在画画图,看看图你会发现函数很神奇的.


好吧好吧,我累死了.你可一定要采纳啊, 我可是很久没这么写过东西了.嘿嘿,

因为a1+a11=a3+a9
所以S11=(a1+a11)*11/2=(a3+a9)*11/2=（24+a9）*11/2=0
所以a9=-24
所以d=(a9-a3)/6=-8
a1=a3-2d=24+16=40
所以an=40-8(n-1)=-8n+48
an=-8n+48>=0
解得n

1. m不等于2
2. m=2,n不等于-3
3. 利用倒角公式
tan45=[-1/2+1/m]/(1+1/2m)=1
或tan45=[-1/m+1/2]/(1+1/2m)=1
m=-3;m=1/3

A=rand(4,5);%随机产生0-1之间的数
C=round(A*(99-10)+10);
sumC=sum(C,2);
D=[C,sumC];

a不等于-2时它为一次函数
a=2,y=4x时它为正比例函数

2x - 3y = a+1
x + 2y = a
2x - 3y = a+1
2x + 4y = 2a
下面式减上面式子 消 x
7y = a -1
y = (a-1)/7
x = a - 2y = a - 2(a-1)/7 = (5a +2)/7
x>0
y>0
5a + 2>0
a-1>0
a > -2/5
a > 1
所以 要使 x y 均为正数,则 a > 1

原式=1-(1+cos2x)/2+√3sin2x-1/2cos2x.x∈R.
=√3sin2x-cos2x+1/2.
=2[(√3/2sin2x-1/2cos2x+1/2.
∴f(x)=2sin(2x-π/6)+1/2.
f(x)的最小证周期T=2π/2=π;
当sin(2x-π/6)=1时,f(x)max=2*1+1/2=5/2；
当sin(2x-π/6)=-1时,f(x)min=2*(-1)+1/2=-3/2.
∴f(x)的值域：f(x)∈[-3/2,5/2}.

ABB CDE EFJ
177 285 546 和15
ABC CDE EFJ
184 436 625 和13
想出一个是一个
做到第三个,发现是坑人的

负1

1.这怎么会看不懂呢?明显是个分段函数
f(x)在x不等于0的点都连续,所以极限存在
在x=0点
f(0+0)=a
f(0-0)=1
若limf(x)存在 则a=1
2.f(x)为x的三次函数,导数为x的二次函数,最多有两个实根
f(0)=f(2)=f(3)=0
罗尔定理
存在a属于（0,2）使f'（a）=0
存在b属于（2,3）使f'（b）=0
所以存在2个实根 所在区间（0,2）,（2,3）

-5=-k+b
1=k+b
∴k=3
b=-2
∴y=3x-2
∵y≥0
∴3x-2≥0
3x≥2
x≥2/3

(1)因为a tb 1/3(a+b)三向量的终点在一直线上
所以tb-a与1/3(a+b)-a要平行,故tb-a=k[1/3(a+b)-a],
移项整理行：（2k-3)a+(3t-k)b=0,又因为a b是两个不共线的向量.
所以2k-3与3t-k都为0,解得t=1/2.
(2)因为a的膜等于b的膜等于2,且a b夹角为60°,
所以a^2=4,b^2=4,ab=2*2*cos60°=2
所以(a-tb)^2=a^2-2tab+(tb)^2=4-4t+4t^2=4（t-1)^2
当t=1时,t-1=0,(a-tb)^2取最小值0,故a-tb的膜也取最小为0
所以当t=1时,a-tb的膜取最小值为0.

cos2x=1-2sin^2x
所以sin^2x=(1-cos2x)/2
y=1/2-cos2x/2+sin2x
=√[1^2+(-1/2)^2]sin(2x+z)+1/2
=√5/2*sin(2x+z)+1/2
其中tanz=(-1/2)/1=-1/2
所以T=2π/2=π
-1(=sin(2x+z)

由题得x²不等于0
所以方程两边同时乘以x²
-2-2x³=0
-2x³=2
x³=-1
x=-1

先列等式：
2a^2+7a-1=6a+2
2a^2-a-3=0
用十字相乘法
(2a-3)(a+1)=0
a=3/2和a=-1

c= |-9|-|-8|=1
a+ |-c|+ |b|=12+7+1=20

数字不重复使用,不计顺序,共5772种：
1,2,23,34,35,
1,2,24,33,35,
1,2,25,32,35,
……
……
16,17,19,21,22,
16,18,19,20,22,
17,18,19,20,21,

设公差为d.Sm=Sk
ma1+m(m-1)d/2=ka1+k(k-1)d/2
(m-k)a1+[m(m-1)-k(k-1)]d/2=0
(m-k)a1+[m²-k²-m+k]d/2=0
(m-k)a1+[(m+k)(m-k)-(m-k)]d/2=0
(m-k)a1+(m-k)(m+k-1)d/2=0
m≠k,等式两边同除以m-k
a1+(m+k-1)d/2=0
a1=-(m+k-1)d/2 a1>0 因此d

f(x)=4cosxsin(x+π/6)-1
=4cosx(√3/2sinx+1/2cosx)-1
=2√3sinx+2cos^2x-1
=√3sin2x+cos2x
= 2sin(2x+π/6)
x∈[-π/6,π/4],则（2x+π/6）∈[-π/6,2π/3]
画个单位圆,一比划就出来了
所以f（x）最大值为2,最小值为-1

y（x²+1）=ax²+8x+b
(y-a)x²-8x+y-b=0
64-4(y-a)(y-b）≥0
y²-(a+b)y+ab-16≤0
a+b=10,ab-16=9
解得a=b=5
f(x)=√（5x²+8x+5)
定义域为R
值域为[√15/5,+∞）

太多了打不开额...
2,7,8,13,15,31
2,7,8,13,16,30
2,7,8,13,17,29
2,7,8,13,18,28
2,7,8,13,19,27
2,7,8,13,20,26
2,7,8,13,21,25
2,7,8,13,22,24
2,7,8,14,15,30
2,7,8,14,16,29
2,7,8,14,17,28
2,7,8,14,18,27
2,7,8,14,19,26
2,7,8,14,20,25
2,7,8,14,21,24
2,7,8,14,22,23
2,7,8,15,16,28
2,7,8,15,17,27
2,7,8,15,18,26
2,7,8,15,19,25
2,7,8,15,20,24
2,7,8,15,21,23
2,7,8,16,17,26
2,7,8,16,18,25
2,7,8,16,19,24
2,7,8,16,20,23
2,7,8,16,21,22
2,7,8,17,18,24
2,7,8,17,19,23
2,7,8,17,20,22
2,7,8,18,19,22
2,7,8,18,20,21
2,7,9,10,15,33
2,7,9,10,16,32
2,7,9,10,17,31
2,7,9,10,18,30
2,7,9,10,19,29
2,7,9,10,20,28
2,7,9,10,21,27
2,7,9,10,22,26
2,7,9,10,23,25
2,7,9,11,14,33
2,7,9,11,15,32
2,7,9,11,16,31
2,7,9,11,17,30
2,7,9,11,18,29
2,7,9,11,19,28
2,7,9,11,20,27
2,7,9,11,21,26
2,7,9,11,22,25
2,7,9,11,23,24
2,7,9,12,13,33
2,7,9,12,14,32
2,7,9,12,15,31
2,7,9,12,16,30
2,7,9,12,17,29
2,7,9,12,18,28
2,7,9,12,19,27
2,7,9,12,20,26
2,7,9,12,21,25
2,7,9,12,22,24
2,7,9,13,14,31
2,7,9,13,15,30
2,7,9,13,16,29
2,7,9,13,17,28
2,7,9,13,18,27
2,7,9,13,19,26
2,7,9,13,20,25
2,7,9,13,21,24
2,7,9,13,22,23
2,7,9,14,15,29
2,7,9,14,16,28
2,7,9,14,17,27
2,7,9,14,18,26
2,7,9,14,19,25
2,7,9,14,20,24
2,7,9,14,21,23
2,7,9,15,16,27
2,7,9,15,17,26
2,7,9,15,18,25
2,7,9,15,19,24
2,7,9,15,20,23
2,7,9,15,21,22
2,7,9,16,17,25
2,7,9,16,18,24
2,7,9,16,19,23
2,7,9,16,20,22
2,7,9,17,18,23
2,7,9,17,19,22
2,7,9,17,20,21
2,7,9,18,19,21
2,7,10,11,13,33
2,7,10,11,14,32
2,7,10,11,15,31
2,7,10,11,16,30
2,7,10,11,17,29
2,7,10,11,18,28
2,7,10,11,19,27
2,7,10,11,20,26
2,7,10,11,21,25
2,7,10,11,22,24
2,7,10,12,13,32
2,7,10,12,14,31
2,7,10,12,15,30
2,7,10,12,16,29
2,7,10,12,17,28
2,7,10,12,18,27
2,7,10,12,19,26
2,7,10,12,20,25
2,7,10,12,21,24
2,7,10,12,22,23
2,7,10,13,14,30
2,7,10,13,15,29
2,7,10,13,16,28
2,7,10,13,17,27
2,7,10,13,18,26
2,7,10,13,19,25
2,7,10,13,20,24
2,7,10,13,21,23
2,7,10,14,15,28
2,7,10,14,16,27
2,7,10,14,17,26
2,7,10,14,18,25
2,7,10,14,19,24
2,7,10,14,20,23
2,7,10,14,21,22
2,7,10,15,16,26
2,7,10,15,17,25
2,7,10,15,18,24
2,7,10,15,19,23
2,7,10,15,20,22
2,7,10,16,17,24
2,7,10,16,18,23
2,7,10,16,19,22
2,7,10,16,20,21
2,7,10,17,18,22
2,7,10,17,19,21
2,7,10,18,19,20
2,7,11,12,13,31
2,7,11,12,14,30
2,7,11,12,15,29
2,7,11,12,16,28
2,7,11,12,17,27
2,7,11,12,18,26
2,7,11,12,19,25
2,7,11,12,20,24
2,7,11,12,21,23
2,7,11,13,14,29
2,7,11,13,15,28
2,7,11,13,16,27
2,7,11,13,17,26
2,7,11,13,18,25
2,7,11,13,19,24
2,7,11,13,20,23
2,7,11,13,21,22
2,7,11,14,15,27
2,7,11,14,16,26
2,7,11,14,17,25
2,7,11,14,18,24
2,7,11,14,19,23
2,7,11,14,20,22
2,7,11,15,16,25
2,7,11,15,17,24
2,7,11,15,18,23
2,7,11,15,19,22
2,7,11,15,20,21
2,7,11,16,17,23
2,7,11,16,18,22
2,7,11,16,19,21
2,7,11,17,18,21
2,7,11,17,19,20
2,7,12,13,14,28
2,7,12,13,15,27
2,7,12,13,16,26
2,7,12,13,17,25
2,7,12,13,18,24
2,7,12,13,19,23
2,7,12,13,20,22
2,7,12,14,15,26
2,7,12,14,16,25
2,7,12,14,17,24
2,7,12,14,18,23
2,7,12,14,19,22
2,7,12,14,20,21
2,7,12,15,16,24
2,7,12,15,17,23
2,7,12,15,18,22
2,7,12,15,19,21
2,7,12,16,17,22
2,7,12,16,18,21
2,7,12,16,19,20
2,7,12,17,18,20
2,7,13,14,15,25
2,7,13,14,16,24
2,7,13,14,17,23
2,7,13,14,18,22
2,7,13,14,19,21
2,7,13,15,16,23
2,7,13,15,17,22
2,7,13,15,18,21
2,7,13,15,19,20
2,7,13,16,17,21
2,7,13,16,18,20
2,7,13,17,18,19
2,7,14,15,16,22
2,7,14,15,17,21
2,7,14,15,18,20
2,7,14,16,17,20
2,7,14,16,18,19
2,7,15,16,17,19
2,8,9,10,14,33
2,8,9,10,15,32
2,8,9,10,16,31
2,8,9,10,17,30
2,8,9,10,18,29
2,8,9,10,19,28
2,8,9,10,20,27
2,8,9,10,21,26
2,8,9,10,22,25
2,8,9,10,23,24
2,8,9,11,13,33
2,8,9,11,14,32
2,8,9,11,15,31
2,8,9,11,16,30
2,8,9,11,17,29
2,8,9,11,18,28
2,8,9,11,19,27
2,8,9,11,20,26
2,8,9,11,21,25
2,8,9,11,22,24
2,8,9,12,13,32
2,8,9,12,14,31
2,8,9,12,15,30
2,8,9,12,16,29
2,8,9,12,17,28
2,8,9,12,18,27
2,8,9,12,19,26
2,8,9,12,20,25
2,8,9,12,21,24
2,8,9,12,22,23
2,8,9,13,14,30
2,8,9,13,15,29
2,8,9,13,16,28
2,8,9,13,17,27
2,8,9,13,18,26
2,8,9,13,19,25
2,8,9,13,20,24
2,8,9,13,21,23
2,8,9,14,15,28
2,8,9,14,16,27
2,8,9,14,17,26
2,8,9,14,18,25
2,8,9,14,19,24
2,8,9,14,20,23
2,8,9,14,21,22
2,8,9,15,16,26
2,8,9,15,17,25
2,8,9,15,18,24
2,8,9,15,19,23
2,8,9,15,20,22
2,8,9,16,17,24
2,8,9,16,18,23
2,8,9,16,19,22
2,8,9,16,20,21
2,8,9,17,18,22
2,8,9,17,19,21
2,8,9,18,19,20
2,8,10,11,12,33
2,8,10,11,13,32
2,8,10,11,14,31
2,8,10,11,15,30
2,8,10,11,16,29
2,8,10,11,17,28
2,8,10,11,18,27
2,8,10,11,19,26
2,8,10,11,20,25
2,8,10,11,21,24
2,8,10,11,22,23
2,8,10,12,13,31
2,8,10,12,14,30
2,8,10,12,15,29
2,8,10,12,16,28
2,8,10,12,17,27
2,8,10,12,18,26
2,8,10,12,19,25
2,8,10,12,20,24
2,8,10,12,21,23
2,8,10,13,14,29
2,8,10,13,15,28
2,8,10,13,16,27
2,8,10,13,17,26
2,8,10,13,18,25
2,8,10,13,19,24
2,8,10,13,20,23
2,8,10,13,21,22
2,8,10,14,15,27
2,8,10,14,16,26
2,8,10,14,17,25
2,8,10,14,18,24
2,8,10,14,19,23
2,8,10,14,20,22
2,8,10,15,16,25
2,8,10,15,17,24
2,8,10,15,18,23
2,8,10,15,19,22
2,8,10,15,20,21
2,8,10,16,17,23
2,8,10,16,18,22
2,8,10,16,19,21
2,8,10,17,18,21
2,8,10,17,19,20
2,8,11,12,13,30
2,8,11,12,14,29
2,8,11,12,15,28
2,8,11,12,16,27
2,8,11,12,17,26
2,8,11,12,18,25
2,8,11,12,19,24
2,8,11,12,20,23
2,8,11,12,21,22
2,8,11,13,14,28
2,8,11,13,15,27
2,8,11,13,16,26
2,8,11,13,17,25
2,8,11,13,18,24
2,8,11,13,19,23
2,8,11,13,20,22
2,8,11,14,15,26
2,8,11,14,16,25
2,8,11,14,17,24
2,8,11,14,18,23
2,8,11,14,19,22
2,8,11,14,20,21
2,8,11,15,16,24
2,8,11,15,17,23
2,8,11,15,18,22
2,8,11,15,19,21
2,8,11,16,17,22
2,8,11,16,18,21
2,8,11,16,19,20
2,8,11,17,18,20
2,8,12,13,14,27
2,8,12,13,15,26
2,8,12,13,16,25
2,8,12,13,17,24
2,8,12,13,18,23
2,8,12,13,19,22
2,8,12,13,20,21
2,8,12,14,15,25
2,8,12,14,16,24
2,8,12,14,17,23
2,8,12,14,18,22
2,8,12,14,19,21
2,8,12,15,16,23
2,8,12,15,17,22
2,8,12,15,18,21
2,8,12,15,19,20
2,8,12,16,17,21
2,8,12,16,18,20
2,8,12,17,18,19
2,8,13,14,15,24
2,8,13,14,16,23
2,8,13,14,17,22
2,8,13,14,18,21
2,8,13,14,19,20
2,8,13,15,16,22
2,8,13,15,17,21
2,8,13,15,18,20
2,8,13,16,17,20
2,8,13,16,18,19
2,8,14,15,16,21
2,8,14,15,17,20
2,8,14,15,18,19
2,8,14,16,17,19
2,8,15,16,17,18
2,9,10,11,12,32
2,9,10,11,13,31
2,9,10,11,14,30
2,9,10,11,15,29
2,9,10,11,16,28
2,9,10,11,17,27
2,9,10,11,18,26
2,9,10,11,19,25
2,9,10,11,20,24
2,9,10,11,21,23
2,9,10,12,13,30
2,9,10,12,14,29
2,9,10,12,15,28
2,9,10,12,16,27
2,9,10,12,17,26
2,9,10,12,18,25
2,9,10,12,19,24
2,9,10,12,20,23
2,9,10,12,21,22
2,9,10,13,14,28
2,9,10,13,15,27
2,9,10,13,16,26
2,9,10,13,17,25
2,9,10,13,18,24
2,9,10,13,19,23
2,9,10,13,20,22
2,9,10,14,15,26
2,9,10,14,16,25
2,9,10,14,17,24
2,9,10,14,18,23
2,9,10,14,19,22
2,9,10,14,20,21
2,9,10,15,16,24
2,9,10,15,17,23
2,9,10,15,18,22
2,9,10,15,19,21
2,9,10,16,17,22
2,9,10,16,18,21
2,9,10,16,19,20
2,9,10,17,18,20
2,9,11,12,13,29
2,9,11,12,14,28
2,9,11,12,15,27
2,9,11,12,16,26
2,9,11,12,17,25
2,9,11,12,18,24
2,9,11,12,19,23
2,9,11,12,20,22
2,9,11,13,14,27
2,9,11,13,15,26
2,9,11,13,16,25
2,9,11,13,17,24
2,9,11,13,18,23
2,9,11,13,19,22
2,9,11,13,20,21
2,9,11,14,15,25
2,9,11,14,16,24
2,9,11,14,17,23
2,9,11,14,18,22
2,9,11,14,19,21
2,9,11,15,16,23
2,9,11,15,17,22
2,9,11,15,18,21
2,9,11,15,19,20
2,9,11,16,17,21
2,9,11,16,18,20
2,9,11,17,18,19
2,9,12,13,14,26
2,9,12,13,15,25
2,9,12,13,16,24
2,9,12,13,17,23
2,9,12,13,18,22
2,9,12,13,19,21
2,9,12,14,15,24
2,9,12,14,16,23
2,9,12,14,17,22
2,9,12,14,18,21
2,9,12,14,19,20
2,9,12,15,16,22
2,9,12,15,17,21
2,9,12,15,18,20
2,9,12,16,17,20
2,9,12,16,18,19
2,9,13,14,15,23
2,9,13,14,16,22
2,9,13,14,17,21
2,9,13,14,18,20
2,9,13,15,16,21
2,9,13,15,17,20
2,9,13,15,18,19
2,9,13,16,17,19
2,9,14,15,16,20
2,9,14,15,17,19
2,9,14,16,17,18
2,10,11,12,13,28
2,10,11,12,14,27
2,10,11,12,15,26
2,10,11,12,16,25
2,10,11,12,17,24
2,10,11,12,18,23
2,10,11,12,19,22
2,10,11,12,20,21
2,10,11,13,14,26
2,10,11,13,15,25
2,10,11,13,16,24
2,10,11,13,17,23
2,10,11,13,18,22
2,10,11,13,19,21
2,10,11,14,15,24
2,10,11,14,16,23
2,10,11,14,17,22
2,10,11,14,18,21
2,10,11,14,19,20
2,10,11,15,16,22
2,10,11,15,17,21
2,10,11,15,18,20
2,10,11,16,17,20
2,10,11,16,18,19
2,10,12,13,14,25
2,10,12,13,15,24
2,10,12,13,16,23
2,10,12,13,17,22
2,10,12,13,18,21
2,10,12,13,19,20
2,10,12,14,15,23
2,10,12,14,16,22
2,10,12,14,17,21
2,10,12,14,18,20
2,10,12,15,16,21
2,10,12,15,17,20
2,10,12,15,18,19
2,10,12,16,17,19
2,10,13,14,15,22
2,10,13,14,16,21
2,10,13,14,17,20
2,10,13,14,18,19
2,10,13,15,16,20
2,10,13,15,17,19
2,10,13,16,17,18
2,10,14,15,16,19
2,10,14,15,17,18
2,11,12,13,14,24
2,11,12,13,15,23
2,11,12,13,16,22
2,11,12,13,17,21
2,11,12,13,18,20
2,11,12,14,15,22
2,11,12,14,16,21
2,11,12,14,17,20
2,11,12,14,18,19
2,11,12,15,16,20
2,11,12,15,17,19
2,11,12,16,17,18
2,11,13,14,15,21
2,11,13,14,16,20
2,11,13,14,17,19
2,11,13,15,16,19
2,11,13,15,17,18
2,11,14,15,16,18
2,12,13,14,15,20
2,12,13,14,16,19
2,12,13,14,17,18
2,12,13,15,16,18
2,12,14,15,16,17
3,4,5,6,25,33
3,4,5,6,26,32
3,4,5,6,27,31
3,4,5,6,28,30
3,4,5,7,24,33
3,4,5,7,25,32
3,4,5,7,26,31
3,4,5,7,27,30
3,4,5,7,28,29
3,4,5,8,23,33
3,4,5,8,24,32
3,4,5,8,25,31
3,4,5,8,26,30
3,4,5,8,27,29
3,4,5,9,22,33
3,4,5,9,23,32
3,4,5,9,24,31
3,4,5,9,25,30
3,4,5,9,26,29
3,4,5,9,27,28
3,4,5,10,21,33
3,4,5,10,22,32
光2,3开头的也打不开.
你要的话+qq或是hi我发给你- -｜

不知道你的真实意思：如果只想把各列的数提出来,只要复制,用“粘贴——选择性粘贴——数值”即可.公式就不会跟倒去了.

印刷出片分色的时候把图案分成了四种颜色,即三原色加黑色,本来三原色足以满足印刷所需要的颜色,但是为了减少油墨堆积的厚度,人们就把黑色来替代一些颜色比较深的.通常把文件出成板子的时候,就以网点的形式生成在版子上,四色的和值就是三原色加黑色的值不得超过220.

当a＝0时,有最小值,为1

答案：D首先就是参数问题,由题意可知,可排除A,C,在B和D中,就得看函数的返回值类型了,B中的返回值类型没有写,故C语言中,默认的就是int类型了.所以,返回值类型必须写为double,不能省略；其次就是您的return 了.这个没...

4x-2m=3x-1 4x-3x-2m+1=0 x-2m+1=0 (1)
x=2x+3-3m 2x-3m+3-x=0 x-3m+3=0 (2)
两个方程的解相等,（1）式=（2）式
x-2m+1= x-3m+3
-2m+1=-3m+3
3m-2m=3-1
m=2

0.18比1.2=18/120=3/20
六分之一比九分之一=1/6:1/9=9:6=3:2
五分之一比0.5 =1/5:0.5=0.2:0.5=2:5
3比四分之一=3:1/4=12:1

十一个数挑出五个的可能性有11X10X9X8X7/(5X4X3X2)=462种
30/5=6
以6和中心
其中和是30的情况有
1,2,6,10,11
1,3,6,9,11
1,4,6,8,11
1,5,6,7,11
2,3,6,9,10
2,4,6,8,10
2,5,6,7,10
3,4,6,8,9
3,5,6,7,9
4,5,6,7,8
共10种组合
以7为中心的组合有
1,2,7,9,11
1,3,7,8,11
1,3,7,9,10
1,4,7,8,10
共4种
以5为中心的组合有
1,3,5,10,11
1,4,5,9,11
共2种组合
以8为中心的组合有
1,2,8,9,10
共1种
一共有17种组合的和值是30
所以这个概率是30/462=5/77

我也算的是17004.Maple代码如下:
with(combinat):f:=proc()local S,a,b,L,m:m:=0:for a to 14 do for b from 15 to 33 do S:={$a+1..b-1}:for L in choose(S,4) do if add(i,i=L)=89-a-b then m:=m+1:fi:od:od:od:m:end:f();

﹙n－2﹚×180°＝1780°－α
n＝11＋﹙160°－α﹚/180°
160°－α＝0
α＝160°
n＝11

第一,177 ,285,564,第二,175,562,283,第三,我怀疑ABC和BCE和值加起来一样不存在,不允许A和E是同一数,我想不到.

sin0=0, sin30=1/2, sin45=√2/2, sin60=√3/2, sin90=1,
cos0=1, cos30=√3/2, cos45=√2/2, cos60=1/2, cos90=0
tan0=1, tan30=√3/3, tan45=1 , tan60==√3 ,tan90不存在
cot0不存在, cot30=√3, cot45=1, cot60=√3/3 , cot90=1
两角和公式
sin(a+b)=sinacosb+cosasinb
sin(a-b)=sinacosb-sinbcosa ?
cos(a+b)=cosacosb-sinasinb
cos(a-b)=cosacosb+sinasinb
tan(a+b)=(tana+tanb)/(1-tanatanb)
tan(a-b)=(tana-tanb)/(1+tanatanb)
cot(a+b)=(cotacotb-1)/(cotb+cota) ?
cot(a-b)=(cotacotb+1)/(cotb-cota)
倍角公式
tan2a=2tana/[1-(tana)^2]
cos2a=(cosa)^2-(sina)^2=2(cosa)^2 -1=1-2(sina)^2
sin2a=2sina*cosa
半角公式
sin(a/2)=√((1-cosa)/2) sin(a/2)=-√((1-cosa)/2)
cos(a/2)=√((1+cosa)/2) cos(a/2)=-√((1+cosa)/2)
tan(a/2)=√((1-cosa)/((1+cosa)) tan(a/2)=-√((1-cosa)/((1+cosa))
cot(a/2)=√((1+cosa)/((1-cosa)) cot(a/2)=-√((1+cosa)/((1-cosa)) ?
tan(a/2)=(1-cosa)/sina=sina/(1+cosa)
和差化积
2sinacosb=sin(a+b)+sin(a-b)
2cosasinb=sin(a+b)-sin(a-b) )
2cosacosb=cos(a+b)-sin(a-b)
-2sinasinb=cos(a+b)-cos(a-b)
sina+sinb=2sin((a+b)/2)cos((a-b)/2
cosa+cosb=2cos((a+b)/2)sin((a-b)/2)
tana+tanb=sin(a+b)/cosacosb
积化和差公式
sin(a)sin(b)=-1/2*[cos(a+b)-cos(a-b)]
cos(a)cos(b)=1/2*[cos(a+b)+cos(a-b)]
sin(a)cos(b)=1/2*[sin(a+b)+sin(a-b)]
诱导公式
sin(-a)=-sin(a)
cos(-a)=cos(a)
sin(pi/2-a)=cos(a)
cos(pi/2-a)=sin(a)
sin(pi/2+a)=cos(a)
cos(pi/2+a)=-sin(a)
sin(pi-a)=sin(a)
cos(pi-a)=-cos(a)
sin(pi+a)=-sin(a)
cos(pi+a)=-cos(a)
tga=tana=sina/cosa
万能公式
sin(a)= (2tan(a/2))/(1+tan^2(a/2))
cos(a)= (1-tan^2(a/2))/(1+tan^2(a/2))
tan(a)= (2tan(a/2))/(1-tan^2(a/2))
其它公式
a*sin(a)+b*cos(a)=sqrt(a^2+b^2)sin(a+c) [其中,tan(c)=b/a]
a*sin(a)-b*cos(a)=sqrt(a^2+b^2)cos(a-c) [其中,tan(c)=a/b]
1+sin(a)=(sin(a/2)+cos(a/2))^2
1-sin(a)=(sin(a/2)-cos(a/2))^2
其他非重点三角函数
csc(a)=1/sin(a)
sec(a)=1/cos(a)
双曲函数
sinh(a)=(e^a-e^(-a))/2
cosh(a)=(e^a+e^(-a))/2
tgh(a)=sinh(a)/cosh(a)

f(x)在 [1,+∞)上为增函数,
所以 (B-1)^2/2+1=B,
B^2-2B+1+2=2B
B^2-4B+3=0
(B-1)(B-3)=0
B=1(舍去）,B=3

4*（x的平方+1/4x)-3
4*(x+1/4)的平方-1/4-3
4*(x+1/4)的平方>=0
当4*(x+1/4)的平方=0时值最小
即x=-1/4时最小值为3又1/4