x |
x2 |
4m |
2m+4 |
x+π |
x |
b2-4 |
b+2 |
a-b |
b-a |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
x2 |
4m |
2m+4 |
x+π |
x |
b2-4 |
b+2 |
a-b |
b-a |
a |
3x |
x+y |
x2-y2 |
a2-b2 |
a-b |
x+y |
x-y |
A.1 | B.2 | C.3 | D.4 |
A.
| B.
| C.
| D.
|
A.
| B.
| C.
| D.
|
x2-1 |
x2+x |
x+y |
x2-y2 |
x2-x-2 |
x+1 |
16x2-4 |
x+4 |
A.4 | B.3 | C.2 | D.1 |
b |
2a |
(x+y)2 |
xy+y2 |
m+n |
m2-n2 |
2x |
x2+1 |
x-1 |
x2-1 |
A.1个 | B.2个 | C.3个 | D.4个 |
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