1 |
x |
1 |
y |
2x-14xy-2y |
x-2xy-y |
1 |
x |
1 |
y |
2x-2y-14xy |
(x-y)-2xy |
2(x-y)-14xy |
(x-y)-2xy |
2×(-3xy)-14xy |
-3xy-2xy |
-20xy |
-5xy |
A.
| B.
| ||||||||
C.
| D.
|
x+y |
xy |
A.不变 | B.扩大为原来的2倍 | ||||
C.缩小为原来的
| D.缩小为原来的
|
a2 |
2a+3b |
A.扩大5倍 | B.不变 | C.缩小5倍 | D.无法确定 |
a |
b |
2 |
3 |
a |
a+b |
xy |
x+y |
A.扩大4倍 | B.扩大2倍 | C.不变 | D.缩小2倍 |
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