a2-4 |
a2+2a-8 |
a2-4a+4 |
a-2 |
x2-1 |
x2-4x+4 |
x2-3x+2 |
x-1 |
(a+2)(a-2) |
(a+4)(a-2) |
1 |
(a+2)(a-2) |
(a-2)2 |
a-2 |
1 |
a+4 |
(x+1)(x-1) |
(x-2)2 |
1 |
x+1 |
(x-1)(x-2) |
x-1 |
x-1 |
x-2 |
ab2 |
2c2 |
-3a2b2 |
4cd |
-3 |
2d |
y |
x |
x2 |
y |
4(m+n) |
4m2+8mn+4n2 |
1 |
m+n |
x+y+1 |
-x+y+1 |
m2-3m+2 |
m-m2 |
2-m |
m |
1 |
a+b |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
6y2 |
x2 |
4y |
m-m2 |
m2-1 |
m |
m-1 |
m+1 |
m-1 |
x-y |
x+2y |
x2-y2 |
x2+4xy+4y2 |
2x |
y |
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