2ab |
a+b |
A.扩大20倍 | B.不变 | C.扩大10倍 | D.缩小10倍 |
2ab |
a+b |
2?10a?10b |
10a+10b |
2ab?10 |
a+b |
2ab |
a+b |
2ab |
a+b |
x |
x+y |
A.扩大2倍 | B.缩小2倍 | C.改变 | D.不改变 |
x2y+xy2 |
2xy |
a+
| ||||
|
b2 |
2a |
b2×( ) |
2a×( ) |
2ab3 |
4a2b |
6a3b |
3ab2 |
6a3b÷( ) |
3ab2÷( ) |
2a2 |
b |
1 |
3 |
1 |
a |
1 |
b |
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