(5a^2-8ab-6a)/6a

即：2-8/9×〔x÷（7/16-1/4）〕-2/9=0
x÷（7/16-1/4）=（2-2/9）÷8/9
x=（18/9 -2/9）×9/8×（7/16-4/16）
=16/9×9/8×3/16
=3/8

（x^2-x）^2+3x(x-1)-54
=[x(x－1)]²+3x(x-1)-54
=[x(x－1)＋9][x(x－1)－6]
=(x²－x－9)(x²－x－6)
=(x²－x－9)(x－3)(x＋2)
(m^2+3m)^2-8(m^2+3m)+16
=(m^2+3m－4)²
=(m＋4)²(m－1)²
(c^2-a^2-b^2)^2-4a^2b^2
=(c^2-a^2-b^2＋2ab)(c^2-a^2-b^2－2ab)
=[c²－(a²－2ab＋b²)][c²－(a²＋2ab＋b²)]
=[c²－(a－b)²][c²－(a＋b)²]
=(c＋a－b)(c－a＋b)(c＋a＋b)(c－a－b)

无聊,干嘛问这个.

(a^2-5ab-3b^2)/(a^2-8ab-9b^2)
=(a²/b²-5a/b-3)/(a²/b²-8a/b-9)
=(9+5×3-3)/(9+8×3-9)
=21/24
=7/8;
如果本题有什么不明白可以追问,

当x=1时,ax^2+2bx=5
x=1带入ax^2+2bx=5
a*1^2+2b*1=5
a+2b=5
x=-1带入4ax^2-8bx
4a*(-1)^2-8b*(-1)
=4a*1+8b
=4(a+2b)
=4*5
=20

这是一元一次方程吧
（100-X）*2-8=X 【这是原式】
2*100-2*X-8=X 【把左边分解】
200-8=X+2X 【把各数合并】
192=3X 【这不用解释了吧~】
X=64
大概就是这样了

16(x+5)^2-8(x+5)+1=0
【4(x+5)】^2-8(x+5)+1²=0
【4（x+5）-1】²=0
（4x+19）²=0
4x+19=0
x= -4分之19

x=1/10
x=8/3
x=9/16

a^3-a^2*b-a+b
=a²﹙a－b﹚－﹙a－b﹚
=﹙a－b﹚﹙a²－1﹚
=﹙a－b﹚﹙a＋1﹚﹙a－1﹚
（x^2+x)^2-8(x^2+x)+12
=﹙x²＋x－2﹚﹙x²＋x－6﹚
=﹙x＋2﹚﹙x－1﹚﹙x＋3﹚﹙x－2﹚

3x^2-4x+6=9
3x^2-4x=(9-6)=3
(3x^2-4x)/3=3/3=1
得到x^2-4/3x=1
所以2x^2-8/3x=2

Sn=2^2-4^2+6^2-8^2+.+(-1)^n+1 *(2n)^2
=2^2(1^2-2^2+3^2-4^2+……+（-1）^(n-1)*n^2)
当n为偶数时
原式=4（1^2-2^2+3^2-4^2+……+(n-1)^2-n^2）
=4[(1+2)(1-2)+(3-4)*(3+4)+……+（n-1+n）(n-1-n)]
=-4(1+2+3+……+n)=-4*n(n+1)/2=-2n(n+1);
注意用了平方差公式,刚好n/2对平方差
当n为奇数时
原式=4（1^2-2^2+3^2-4^2+……+(n-2)^2-（n-1）^2+n^2）
=4[1+(3+2)(3-2)+(5-4)(5+4)+……+(n+n-1)(n-(n-1))]
=4(1+2+3+……+n-1+n)
=2n(n+1){注意一共（n-1）/2对平方差,剩余一个1}
综上所述
Sn=（-1）^(n-1)*2n(n+1)(n是整数,n>0)

4y+2-16y-8+15=0 所以-12y+9=0 所以y=3/4
X‘’-2√2x+(√2)"=0 所以（x-√2）''=0 所以x=√2
化为 （√2)''x''-2√2y-3=0 变为（√2y+1）（√2y-3）=0 所以 y=-√2/2 y=3√2/2
没时间了,

t^2-8t-44=0
t^2-8y+16-60=0
(t-4)^2=60
t-4=±√60
t=4±2√15

两边乘-x
x²+2x+8=0
(x+1)²=-7

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X1=(2√5+2√3)/2 X2=(2√5-2√3)/2
(X-1)^2=8/9 X1=2√2/3+1 X2=-2√2/3+1

lim下x→2 2x^2-8/x^2-4=2

我知道你的意思,化简麻.这题用十字相乘法.化简过后为：(x^4-4)^2

把上面三个式子相加即有:
a^2-6b+b^2-8c+c^2-4a+29=0;
配方得到:
(a-2)^2+(b-3)^2+(c-4)^2=0;
所以只有:(a-2)^2=(b-3)^2=(c-4)^2=0;
即得到a=2;b=3;c=4;

8ab-4a²b²-8ab²+2ab-2ab²+4a²b²
=10ab-10ab²
=10(ab-ab²)
=10*(-2)=-20