x |
y |
y |
x |
1 |
y |
1 |
x |
1+x |
y |
x-y |
x |
(x-y)(x+y) |
xy |
1 |
x+y |
x-y |
y |
y |
1+x |
x-y |
x |
x-y |
xy |
x-y |
y |
y |
1+x |
x-y |
x |
(x-y)(1+x) |
xy |
y |
1+x |
x-y |
x |
(x-y)2 |
x2 |
2a |
a2-4 |
1 |
a-2 |
2x |
x-3 |
x |
x+3 |
x2-9 |
x |
a2+1 |
a |
(a+2)(a-1) |
a2+2a |
x |
y |
y |
x |
x+y |
x |
1 |
22 |
27 |
1 |
4 |
|
b |
a-b |
b3 |
a3-2a2b+ab2 |
ab+b2 |
a2-b2 |
12 |
3 |
1 |
x |
A.1 | B.-1 | C.-3 | D.3 |
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