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100*7.9+184*2.1+84*2.9简便计算
人气:388 ℃ 时间:2020-02-06 03:55:14
解答
100*7.9+184*2.1+84*2.9=100*7.9+(100+84)*2.1+84*2.9
=100*7.9+100*2.1+84*2.1+84*2.9
=100*(7.9+2.1)+84*(2.1+2.9)
=100*10+84*5
=1000+420
=1420
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