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已知a,b,c满足c<b<a且ac<0,则下列选项中一定成立的是( ) A.ab...
已知a,b,c满足c<b<a且ac<0,则下列选项中一定成立的是( )
A.ab>ac
B.c(b-a)<0
C.cb2<ab2
D.ac(a-c)>0
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