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下列判断错误的是( ) A.“am2<bm2”是“a<b”的充分不必要条件 B....
下列判断错误的是( )
A.“am2<bm2”是“a<b”的充分不必要条件
B.命题“∀x∈R,x3-x2-1≤0”的否定是“∃x∈R,x3-x2-1>0”
C.若p,q均为假命题,则p∧q为假命题
D.若ξ~B(4,0.25)则Dξ=1
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