3 |
3 |
x+y |
x-y |
x-y |
x+y |
1 |
x2 |
1 |
y2 |
x+y |
x-y |
x-y |
x+y |
1 |
x2 |
1 |
y2 |
(x+y)2-(x-y)2 |
x2-y2 |
y2-x2 |
x2y2 |
-1 |
x2y2 |
4 |
xy |
3 |
3 |
x+y |
x-y |
x-y |
x+y |
1 |
x2 |
1 |
y2 |
3a |
a-2 |
a |
a+2 |
a2-4 |
a+4 |
3 |
1 |
2 |
4 |
a2-4 |
a+2 |
a |
x+1 |
x2-x |
x |
x2-2x+1 |
1 |
x |
2 |
2 |
x |
x+1 |
x+3 |
x+1 |
x2-1 |
x2+4x+3 |
1 |
2 |
a-1 |
a |
1 |
a |
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