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A.命题“∀x∈R,x2-x≤0”的否定是“∃x∈R,x2-x≥0” | ||
B.“若am2≤bm2,则a≤b”的否命题为真 | ||
C.命题“p∧q为真”是命题“p∀q为真”的必要不充分条件 | ||
D.若实数x,y∈[-1,1],则满足x2+y2≥1的概率为
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A.1 | B.2 | C.3 | D.4 |
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A.②③ | B.①②③ | C.②④ | D.①②④ |
A.y=tanx的定义域是R | ||
B.y=
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C.y=
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D.y=sin2x-cos2x的最小正周期是π |
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