3x-2y |
5x+7y |
A.扩大10倍 | B.不变 | ||
C.由x,y的值确定 | D.缩小到原来的
|
3x-2y |
5x+7y |
30x-20y |
50x+70y |
10(3x-2y) |
10(5x+7y) |
3x-2y |
5x+7y |
(a-b)(b-c)(c-a) |
(b-a)(a-c)(c-b) |
A.-1 | B.0 | C.1 | D.2 |
x2-8x+16 |
16-x2 |
-0.2x-1 |
-0.3x+0.5 |
A.
| B.
| C.
| D.
|
x |
y |
x+y |
y |
2y-x |
7x+5y |
2 |
3 |
x |
y |
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