2x2 |
3x-2y |
A.不变 | B.是原来的3倍 | ||
C.是原来的4倍 | D.是原来的
|
2(3x)2 |
3(3x)-2(3y) |
9×2x2 |
3(3x-2y) |
2x2 |
3x-2y |
A.
| ||||
B.
| ||||
C.
| ||||
D.
|
b+c |
-a |
-(b+c) |
a |
-z |
-x2y |
z |
x2y |
1-x |
x-y |
x-1 |
x-y |
2x-3y |
3x-2y |
3x-2y |
2y-3x |
x-y |
x |
2 |
3 |
x+y |
x |
2(x+1) |
x-1 |
1 |
x |
1 |
y |
2x-xy+2y |
3x+5xy+3y |
© 2017-2019 超级试练试题库,All Rights Reserved.