Question

73×86×72×14的简便方法怎么做？

Answer 1

简便运算

＝72*86+86+72*14

＝72*（86+14）+86

＝72*100+86

＝7200+86

＝7286

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Answer 2

最中间的符号是不是“+”号！
73×86+72×14
=(1+72)×86+72×14
=(86+72×86)+72×14
=86+(72×86+72×14)
=86+72×(86+14)
=86+72×100
=86+7200
=7286