3a2bc3 |
15a3bc |
x2-9 |
x-3 |
x2+2x+1 |
x2-1 |
4b2-a2 |
4b2-4ab+a2 |
3a2bc3 |
15a3bc |
c2 |
5a |
x2-9 |
x-3 |
(x+3)(x-3) |
x-3 |
x2+2x+1 |
x2-1 |
(x+1)2 |
(x+1)(x-1) |
x+1 |
x-1 |
4b2-a2 |
4b2-4ab+a2 |
(2b+a)(2b-a) |
(2b-a)2 |
2b+a |
2b-a |
c2 |
5a |
x+1 |
x-1 |
2b+a |
2b-a |
xy |
x+y |
A.不变 | B.扩大10倍 |
C.扩大20倍 | D.缩小为原来的十分之一 |
33+13 |
33+23 |
3+1 |
3+2 |
53+23 |
53+33 |
5+2 |
5+3 |
a3+b3 |
a3+(a-b)3 |
a+b |
a+(a-b) |
a-1 |
a2+2a+1 |
5 |
1-a2 |
a2-4 |
2-a |
A.a+2 | B.a-2 | C.2-a | D.-2-a |
A.
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B.
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C.
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D.
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