a,b,c是三个有理数,若a＞b,且a+b=0,abc＞0,则a+b+c的符号是什么?
人气：328 ℃ 时间：2019-10-18 08:44:23
解答
可以这样考虑：因为a+b=0,可以知道 a= -b
又因为a＞b,所以可以知道 a>0 ,b
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