2x-1 |
2x+1 |
A.1 | B.2 | C.3 | D.0 |
2x-1 |
2x+1 |
1-y |
1+y |
1-y |
1+y |
A.0个 | B.1个 | C.2个 | D.3个 |
1 |
x |
A.命题“若x2-2x-3=0,则x=3”的逆否命题为:“若x≠3,则x2-2x-3≠0” | ||
B.若0<x<
| ||
C.互相平行的两条直线在同一个平面内的射影必然是两条互相平行的直线 | ||
D.“x>2”是“
|
1 |
4 |
A.1个 | B.2个 | C.3个 | D.4个 |
2x+2014 |
3x+7 |
π |
2 |
x1+x2 |
2 |
1 |
2 |
1 |
6 |
π |
6 |
π |
3 |
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