A.∅ | B.{4} | C.{2} | D.{1} |
|
A.{3,4} | B.{1,2,5,6} |
C.{1,2,3,4,5,6} | D.∅ |
2 |
A.{1,2,3,4} | B.{2,3,4} | C.{3,4} | D.{4} |
2-x |
2-x |
A.∅ | B.R | C.(-∞,2] | D.[0,2] |
A.命题p:∃x0∈R,tanx0=1;命题q:∀x∈R,x2-x+1>0,则命题“p∧¬q”是真命题 |
B.集合M={x|x2<4},N={x|x2-2x-3<0},则M∩N={x|-2<x<3} |
C.命题“若x2-3x+2=0,则x=1”的逆否命题为“若x≠1,则x2-3x+2≠0” |
D.函数f(x)=x2+2(m-2)x+4在[1,+∞)上为增函数,则m的取值范围是m<1 |
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