1 |
a |
1 |
b |
5 |
a |
b(a-b) |
b |
a(a-b) |
1 |
a |
1 |
b |
5 |
a+b |
ab |
5 |
a |
b(a-b) |
b |
a(a-b) |
a2 |
ab(a-b) |
b2 |
ab(a-b) |
a2-b2 |
ab(a-b) |
(a+b)(a-b) |
ab(a-b) |
a+b |
ab |
5 |
c |
a2b4 |
a2 |
bc3 |
1 |
x2-4 |
x |
4-2x |
4a |
5b2c |
5b |
-2ac2 |
x-1 |
x2-2x+1 |
1 |
1-x |
b |
a |
b2 |
( ) |
a-b |
a+b |
( ) |
a2-b2 |
x |
x2+2x |
x |
x( ) |
1 |
( ) |
2-x |
-x2+5 |
( ) |
x2-5 |
2x2+2xy |
x+y |
2x |
( ) |
x2+2xy+y2 |
x2-y2 |
2xy |
x+y |
A.扩大3倍 | B.缩小3倍 | C.缩小6倍 | D.不变 |
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