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|a|/a=-1 a在分母,所以a不等於0 |a|=-a 所以a≤0 又a不等於0 所以a<0 選B
當a>0時,-a<0,所以a>-a; 當a=0時,-a=0,所以a=-a; 當a<0時,-a>0,所以a<-a.
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