Question

如果a、b、c滿足c＜b＜a,且ac＜0,那么下列選項中不一定成立的是(    )

A.ab＞ac          B.c(b-a)＞0            C.cb²＜ab²                D.ac(a-c)＜0

Answer 1

解析:∵c＜b＜a,且ac＜0,∴c＜0,a＞0.

    又b²≥0,∴選C.

答案:C