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cbac>ab cb>ab c+b>a+b
a•b>0 a+b<0 |a|<|b| a﹣b>0
cbac>ab cb>ab c+b>a+b
ac>bc |a﹣b|=a﹣b ﹣a<﹣b<c ﹣a﹣c>﹣b﹣c
a>-2 a<-3 a>-b a<-b
ab>bc; ac>bc; ac>ab; ab>ac;
ac>bc |a﹣b|=a﹣b ﹣a<﹣b<c ﹣a﹣c>﹣b﹣c
ac > bc |a–b| = a–b –a <–b < c –a–c >–b–c
, , , 若a,c互为相反数,则下列式子正确的是( ) A.a+b>0 B.a+d>0 C.b+c<0 D.b+d<0