y |
x |
() |
x2 |
a+b |
ab |
() |
a2b |
x2+xy |
x2 |
x+y |
() |
y |
x |
xy |
x2 |
a+b |
ab |
a2+ab |
a2b |
x2+xy |
x2 |
x+y |
x |
xy |
x2 |
a2+ab |
a2b |
x+y |
x |
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) |
x-y |
x2-y2 |
1 |
x-y |
b-a |
c-a |
a-b |
a-c |
|b-a| |
a-b |
-x+y |
-x-y |
x+y |
x-y |
A.1个 | B.2个 | C.3个 | D.4个 |
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