1 |
a |
2x |
π |
a2 |
a+b |
x |
2 |
2 |
x |
a |
a-1 |
x2y3 |
3xy |
A.2 | B.3 | C.4 | D.5 |
2x |
π |
x |
2 |
1 |
a |
a2 |
a+b |
2 |
x |
a |
a-1 |
x2y3 |
3xy |
A.
| B.
| C.
| D.
|
a2-1 |
a2+1 |
A.a≠1 | B.a≠±1 |
C.a≠-1 | D.a为任意实数 |
x+3 |
x-3 |
A.3或-3 | B.3 | C.-3 | D.9 |
x2-9 |
x-3 |
A.3 | B.-3 |
C.±3 | D.以上答案都不对 |
2 |
3-x |
A.x≠3 | B.x=3 | C.x<3 | D.x>3 |
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