35.79×99+357.9的简便计算

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35.79×99+357.9的简便计算
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35.79×99+357.9的简便计算
35.79×99+357.9的简便计算

35.79×99+357.9的简便计算
=35.79*(99+1) +35.79*(10-1)
=3579+35.79*9

=35.79*90+35.79*10
=35.79*(90+10)
=35.79*100
=3579 如果是90,这样就容易算了。
你题中是99,这样看行不:
=35.79*(100-1)+357.9
=3579-35.79+357.9
=3901.11

3901.11

35.79*99+35.79*10
=35.79*(99+10)
=35.79*100+35.79*9
=3901.11

=35.79*(100-1)+357.9=3579+357.9-35.79=3901.11