1+2x |
1-2x |
x-2 |
3x+8 |
1+2x |
1-2x |
1 |
2 |
x-2 |
3x+8 |
8 |
3 |
1 |
2 |
8 |
3 |
b-a |
a+b |
b-a |
a-b |
a-b |
-a-b |
a-b |
-a+b |
a-b |
a+b |
A.1个 | B.2个 | C.3个 | D.4个 |
x2-1 |
x2+x |
A.-1 | B.1 | C.±1 | D.0 |
(
| ||
x2-x |
|x|-2 |
x2+4x+4 |
A.x=-2 | B.x=2 | C.x=-2或x=2 | D.|x|=2 |
x+3 |
x |
5+y |
π |
| ||
4 |
a+b |
a-b |
1 |
m |
A.1个 | B.2个 | C.3个 | D.4个 |
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