x2 |
x2+y2 |
A.2倍 | B.4倍 | C.一半 | D.不变 |
(3x)2 |
(3x)2+(3y)2 |
9x2 |
9x2+9y2 |
9x2 |
9(x2+y2) |
x2 |
x2+y2 |
3x4y |
6x2y2 |
x+2y |
3xy |
A.不变 | B.扩大10倍 | C.缩小10倍 | D.缩小100倍 |
x+5y |
2x |
A.扩大10倍 | B.缩小10倍 | C.扩大2倍 | D.不变 |
A.
| B.
| C.
| D.
|
x+3y |
2x3 |
A.不变 | B.变为原来的3倍 | ||
C.变为原来的9倍 | D.变为原来的
|
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