1 |
1-tana |
1 |
1-tana |
| ||
2 |
| ||
2 |
3 |
| ||
|x|-2009 |
A.x≤2010 | B.x≤2010,且x≠±2009 |
C.x≤2010,且x≠2009 | D.x≤2010,且x≠-20092 |
x2-9 |
x+3 |
A.3 | B.3或-3 | C.-3 | D.0 |
1 |
2x-3 |
A.若x2=4,则x=2 | ||
B.方程x(2x-1)=x的解为x=1 | ||
C.若x2+2x+k=0的一个根为1,则k=-3 | ||
D.若分式
|
x-3 |
x+3 |
A.3 | B.-3 | C.±3 | D.0 |
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