y |
x2-4xy+4y2 |
2 |
x-2y |
y |
(x-2y)2 |
x-2y |
2 |
y |
2(x-2y) |
y |
2(3y--2y) |
1 |
2 |
1 |
a2-a+1 |
1-a |
a3-1 |
a4-a2-2 |
(a6-1)-(a4+a2+1) |
x+y-xy |
x+y+2xy |
y+z-2yz |
y+z+3yz |
x+z-3zx |
x+z+4zx |
2 |
x |
3 |
y |
1 |
z |
1 |
b |
1 |
c |
1 |
a |
1 |
y |
1 |
z |
1 |
x |
1 |
a |
1 |
b |
1 |
c |
1 |
a+b+c |
1 |
an |
1 |
bn |
1 |
cn |
1 |
an+bn+cn |
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