1Given X={1,2,3,4} Y={2,3,4,5} Z={3,4,5,6}

节日快乐2022-10-04 11:39:545条回答

1Given X={1,2,3,4} Y={2,3,4,5} Z={3,4,5,6}
1 What is the intersection of sets X,Y and Z
A{3,4} B{2,3,4} C{3,4,5} D{1,2,3,4,5,6,}
2 Which iterval notation represents the set of all real numbers greater than 2 and less than or equal to 20
A(2,20) B(2,20] C[2,20) D[2,20]
3What is the slope of the line whose equation is 3x-7y=9
A - 3/4 B 3/7 C - 7/3 D 7/3
4 What is the result when 2x^2+3xy-6 is subtracted from x^2-7xy+2
A -x^2 - 10xy +8 B x^2 + 10xy - 8 C -x^2 - 4xy -4 D x^2-4xy - 4
5 what is an equation of the axis of symmetry of the parabola represented by y= - x^2 + 6x -4
A x=3 B y=3 C x=6 D y=6

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199002 共回答了20个问题 | 采纳率90%
1)A 交集
2)B
3)B 斜率
4)A
5)A 对称轴
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第五大
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1.A
2、B
3、B
4、A
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1.A
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3.B
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1. 63-3.2x=1 3.2x=63-1 3.2x=62 x=62÷3.2 x=19.375 2. 3.1×6+4.2x=31.2 18.6+4.2x=31.2 4.2x=31.2-18.6 4.2x=12.6
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yy87913714 1年前 已收到1个回答 举报

萍水相逢1222 幼苗

共回答了14个问题采纳率:71.4% 举报

解题思路:根据反证法假设a是最大边,得出a>b a>c,即可得出[1/a]+[1/a]+[1/a]<[1/b]+[1/b]+[1/c],进而得出矛盾得出原命题正确;
也可以原式 [3/a
2
b
+
1
c]可变形为:[3/a]-[3/b]=[1/c]-[1/b],利用分式的运算得出
3(b−a)
ab
=[b−c/bc],进而利用如果a>b,则c>b,以及如果a<b 则c<b,得出a,b,c的大小,从而得出A的取值范围.

方法一:
若a是最大边则,a>b a>c 所以[1/a]<[1/b],[1/a]<[1/c],
∴[1/a]+[1/a]+[1/a]<[1/b]+[1/b]+[1/c],
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故选:A.

方法二:
原式 [3/a=
2
b+
1
c]可变形为:
[3/a]-[3/b]=[1/c]-[1/b],

3(b−a)
ab=[b−c/bc],
如果a>b,则c>b,此时 [b−a/ab]>[b−c/bc],
展开bc(b-a)>ab(b-c),
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∴0°<A<90°,
如果a<b 则c<b,
同理 c<a,c<a<b,∴0°<A<90°(边推角是根据大边对大角小边对小角推出的范围)
故角A为锐角;
故选:A.

点评:
本题考点: 三角形边角关系.

考点点评: 此题主要考查了三角形的边角关系,根据三角形中大边对大角小边对小角推出A的范围是解题关键.

1年前

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---How do you find the talk given by Mr. Smith?
---How do you find the talk given by Mr. Smith?
---_________.
A. Very well B. Excited C. Boring D. Not at all
麦埃1年前1
吕哥 共回答了17个问题 | 采纳率94.1%
C

你觉得史密斯先生的讲话怎么样? 应该用形容词回答。A well 做形容词只指身体好的;B 只用于修饰你 C 无聊的 D 不是形容词。
谁会这道题:—I've given all my
谁会这道题:—I've given all my
—I've given all my pocket money to the people in Sichuan.
.I hope they can get over the difficulties.

[ ]
A.So am I
B.So have I
C.So I have
D.So I am
jacketfly1年前1
fj1376_cn 共回答了16个问题 | 采纳率75%
B
ask and you will be given what you ask for
ask and you will be given what you ask for
求翻译
虎视天下的哥1年前7
mycancan 共回答了16个问题 | 采纳率87.5%
给出要求你就能得到你要求得到的
At the end of the party, _____ of the girls was given a smal
At the end of the party, _____ of the girls was given a small gift.
[ ]
A. every
B. each
C. all
D. both
鹭中樵1年前1
lploveyou 共回答了18个问题 | 采纳率94.4%
B
The study shows,since the drug's__,it has been given to.a.ap
The study shows,since the drug's__,it has been given to.a.approved b.approval
为什么选B,不能选A呢?
fping9041年前3
xixili1984 共回答了20个问题 | 采纳率100%
这里since为介词,介词短语插在句中,如果看做连词,引导一个状语从句,不经常用于句中,顺便说一句,drug's在此不会是drug is,退一步讲也顶多是个drug was.