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作差:①a-ab=a(1-b)因為a<0,-1<b<0,所以1<1-b<2所以a(1-b)<0所以a-ab<0,即a<ab②ab-ab=ab(1-b)因為a<0,-1<b<0,所以1<1-b<2所以ab(1-b)>0所以ab-ab>0,即ab>ab③a-ab=a(1-b)因為a<0,-1<b…
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