x+y |
x-2y |
A.扩大3倍 | B.不变 | C.缩小3倍 | D.扩大6倍 |
x+y |
x-2y |
3x+3y |
3x-6y |
3(x+y) |
3(x-2y) |
x+y |
x-2y |
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.
| ||||
B.
| ||||
C.
| ||||
D.
|
3 |
x |
3(x+5) |
x(x+5) |
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