A.命题“∃x0∈R,
| ||
B.命题“p∀q为真”是命题“p∧q为真”的充分不必要条件 | ||
C.命题“若am2≤bm2,则a≤b”是假命题 | ||
D.命题“若sinx=siny,则x=y”的逆否命题为真命题 |
x | 20 |
A.f(4.5)<f(7)<f(6.5) | B.f(7)<f(4.5)<f(6.5) |
C.f(7)<f(6.5)<f(4.5) | D.f(4.5)<f(6.5)<f(7) |
a |
b |
a |
b |
a |
b |
a |
b |
π |
6 |
4 |
3 |
A.②③ | B.①② | C.②④ | D.①③ |
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