x+y |
2x |
A.扩大2倍 | B.缩小2倍 | ||
C.缩小为原来的
| D.不变 |
x+y |
2x |
2x+2y |
2?2x |
x+y |
2x |
2y |
x+y |
A.不变 | B.缩小2倍 | C.扩大2倍 | D.扩大4倍 |
x+y |
xy |
A.扩大2倍 | B.不变 | C.缩小2倍 | D.缩小4倍 |
2x3 |
3y2 |
A.不变 | B.扩大2倍 | C.缩小2倍 | D.扩大4倍 |
x2 |
(x+y) |
A.扩大k倍 | B.不变 | C.扩大k2倍 | D.缩小k倍 |
x |
A |
x2 |
(y+1)6 |
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