π |
2 |
A.p∧q | B.p∨(﹁q) | C.(﹁p)∧q | D.p∧(﹁q) |
2 |
3 |
π |
2 |
sinx(1-cosx) |
cosx |
A.若b∈B,则a∉A | B.若a∈A,则b∉B |
C.若b∉B,则a∈A | D.若a∉A,则b∉B |
x2 |
m |
y2 |
2 |
A.p或q | B.¬p或q | C.¬p且q | D.p且q |
A.命题“若a=0,则ab=0”的否命题是:“若a≠0则ab≠0” |
B.若命题p:∃x∈R,x2-x+1<0,则¬p:∀x∈R,x2-x+1≥0 |
C.如果命题“¬p”与命题“p或q”都是真命题,那么命题q一定是真命题 |
D.命题“∃x∈R,x2+2x+2≤0”是真命题 |
A.若x∉A,则y∉A | B.若y∉A,则x∈A |
C.若x∉A,则y∈A | D.若y∈A,则x∉A |
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