b |
a-b |
-a+2b |
a-b |
x+3y |
x2-y2 |
x+2y |
x2-y2 |
2x-3y |
x2-y2 |
b+a-2b |
a-b |
a-b |
a-b |
x+3y-x-2y+2x-3y |
(x+y)(x-y) |
2(x-y) |
(x+y)(x-y) |
2 |
x+y |
x+3 |
(x-2)2 |
A |
x-2 |
B |
(x-2)2 |
3 |
1+a |
6 |
1-a |
12 |
a2-1 |
3x-4 |
x2-3x+2 |
1 |
R |
1 |
R1 |
1 |
R2 |
A.
| B.R1+R2 | ||
C.
| D.以上结果均不对 |
x2 |
1+x2 |
1 |
1+1 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
x |
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