【金杜嵐】評論
舉反例：若題目a<b<0<c，把題目當成(-3)<(-1)<0<1--帶入選項(A) a^2<ab ===> (-3)^2<(-3)(-1) ===> 9<3 (x)(B) bc<ac ===> (-1)(1)<(-3)(1) .....看完整詳解