2x3 |
3y2 |
A.不变 | B.扩大2倍 | C.缩小2倍 | D.扩大4倍 |
2x3 |
3y2 |
2?(2x)3 |
3?(2y)2 |
16y3 |
12y2 |
4x3 |
3y2 |
x2 |
(x+y) |
A.扩大k倍 | B.不变 | C.扩大k2倍 | D.缩小k倍 |
x |
A |
x2 |
(y+1)6 |
A.
| B.
| ||||||||
C.
| D.
|
2(a+b) |
ab |
A.扩大为原来的4倍 | B.扩大为原来的2倍 | ||
C.缩小为原来的
| D.不变 |
2a2+2ab |
3ab+3b2 |
2a |
( ) |
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