4 |
3 |
(x1+x2)2-4x1x2 |
a2+8 |
a2+8 |
4 |
3 |
4 |
3 |
|
A.若sinα=sinβ,则α=β |
B.命题“若x≠1,则x2+x-2≠0”的逆否命题 |
C.命题“x>1,则x2>1”的否命题 |
D.命题“若x>y,则x>|y|”的逆命题 |
A.m≥2 | B.m≤-2 | C.m≤-2,或m≥2 | D.-2≤m≤2 |
n | an |
m | an |
n |
m |
2 |
4 |
1 |
2 |
A.0个 | B.1个 | C.2个 | D.3个 |
1 |
2 |
a |
b |
a |
b |
π |
3 |
a |
b |
a |
π |
4 |
3π |
2 |
1 |
2a |
| ||
2 |
2 |
3 |
4 |
9 |
2 |
3 |
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