1 |
x |
1 |
y |
x+2xy+y |
2x-3xy+2y |
1 |
x |
1 |
y |
x+2xy+y |
2x-3xy+2y |
(x+y)+2xy |
2(x+y)-3xy |
5xy |
3xy |
5 |
3 |
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
|
(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 |
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