39+39x99简便算法

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39+39x99简便算法

39+39x99简便算法
39+39x99简便算法

39+39x99简便算法
39*(1+99)=3900

39+39x99
=39*(1+99)
=39*100
=3900

=39*(1+99)
=39*100
=3900

39+39X99=39*(1+99)=39*100=3900

39*100=3900

=39+39*(100-1)
=39+3900-39
=3900

39*(1+99)=3900

39+39x99
=33*(1+99)
=33*100
=3300

39*(1+99)
=39*100
=390
答:39乘(1加99)得390.