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简便方法计算72+5*720+49*72
人气:202 ℃ 时间:2020-01-01 11:06:53
解答
72+5×720+49×72
=1×72+5×720+49×72
=(1+49)×72+5×720
=50×72+5×720
=3600+3600
=7200
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