2x2 |
x+y |
A.扩大两倍 | B.不变 | C.不能确定 | D.缩小两倍 |
2×(2x)2 |
2x+2y |
2x2 |
x+y |
2m |
m+2n |
A.扩大两倍 | B.不变 | C.缩小两倍 | D.无法确定 |
2xy |
x+y |
A.扩大到原来的2倍 | B.缩小2倍 | ||
C.是原来的
| D.不变 |
x |
y |
x+y |
y |
A.
| B.xy | C.4 | D.
|
x |
2x+y |
A.扩大4倍 | B.扩大2倍 | C.不变 | D.缩小2倍 |
x2 |
x+y |
A.扩大3倍 | B.不变 | C.缩小3倍 | D.扩大9倍 |
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