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85问答库 > 下列说法：①若a为有理数，则-a为负有理数；②若a≠0，b≠0，则a+b≠0；③若a+b=0，则a 3 +b 3 =0；④若a

下列说法：①若a为有理数，则-a为负有理数；②若a≠0，b≠0，则a+b≠0；③若a+b=0，则a 3 +b 3 =0；④若a

2024-11-20 11:46:03

推荐回答（1个）

回答1：

①有理数a若为0，则-a为0，0既不是正数也不是负数，故本小题错误；
②若a≠0，b≠0，a、b互为相反数，则a+b=0，故本小题错误；
③若a+b=0，则a、b互为相反数，a³ +b³ =0，正确；
④若a² =（-b）² ，则|a|=|b|，正确，
所以，正确的有③④共2个．
故选C．

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