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一、选择题1.已知a,b∈R,则().(A)若a3>b3,ab>0,那么1a<1b(B)若ac>bc,那么a>b(C)若a>b,那么ac2>bc2(D)若a2>b2,ab>0,那么1a<1b2.下列各组不等式中同解的一组是().(A)lg(x-a)2...
First, multiple choice 1. Given a, b∈R, then (). (A) if a3> b3, ab> 0 then 1a <1b (B) if ac> bc then a> b (C) 0, then 1a <1b2. The following groups of inequalities with the solution of a group is (). (A) lg (x-a) 2