21=2+19,21=3×7,21=23-2;
所以,21=2+19=3×7=23-2
故答案为:2,19;3,7;
填质数:21=_+_=_×_=_-_.
填质数:21=______+______=______×______=______-______.
数学人气:779 ℃时间:2020-01-04 01:10:11
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