9a2(x+y) |
3a(x+y) |
9-x2 |
x2+5x+6 |
an+2-a2bn |
a2n+1-ab2n |
-(x+y)(x-y)2 |
(y+x)(y2-x2) |
a2+b2-c2+2ab |
a2-b2-c2-2bc |
(3-x)(3+x) |
(x+2)(x+3) |
3-x |
x+2 |
a2(an-bn) |
a(an+bn)(an-bn) |
a |
an+bn |
-(x+y)(x-y)2 |
(y+x)(y-x)(y+x) |
x-y |
x+y |
(a+b)2-c2 |
a2-(b+c)2 |
(a+b+c)(a+b-c) |
(a-b-c)(a+b+c) |
a+b-c |
a-b-c |
x+y |
x-2y |
A.扩大3倍 | B.不变 | C.缩小3倍 | D.扩大6倍 |
y |
x |
() |
x2 |
a+b |
ab |
() |
a2b |
x2+xy |
x2 |
x+y |
() |
2x |
x+y |
A.不变 | B.扩大到原来的2倍 |
C.扩大到原来的4倍 | D.缩小到原来的2倍 |
2y |
x |
() |
x3 |
ab |
a2 |
b |
() |
1 |
mn |
() |
4m3n |
a2 |
a2+ab |
a |
() |
A.
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B.
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C.
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D.
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