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某数的立方与28的和为1，则这个数是____．
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某数的立方与28的和为1，则这个数是____．
时间：2022-01-10 00:58
关键词：
军考类
军队院校生长军（警）官招生考试
答案解析
-3
设这个数是x，则依题意有x3＋28＝1，x3＝－27＝（－3）3，解得x＝－3．所以这个数是－3．
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