求这4道题的简算,要有过程
2014-11-20
展开全部
781乘701
=781乘(700+1)
=781乘700+781乘1
=54700+781
=55481
37乘102
=37乘(100+2)
37乘100+37乘2
3700+74
3774
98乘89
=89乘(100-2)
=89乘100-89乘2
=8900-178
=7722
78乘34+78+65乘34
=78乘34+78乘1+65乘34
=78乘(34+1+34)
=78乘100
=7800
=781乘(700+1)
=781乘700+781乘1
=54700+781
=55481
37乘102
=37乘(100+2)
37乘100+37乘2
3700+74
3774
98乘89
=89乘(100-2)
=89乘100-89乘2
=8900-178
=7722
78乘34+78+65乘34
=78乘34+78乘1+65乘34
=78乘(34+1+34)
=78乘100
=7800
追问
最后一道错的了
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