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3.19除以17列竖式计算除法

3.19÷17=0.18 竖式见图:

(17-2)÷5 =15÷5 =3

用乘法分配律 184x17+184x83 =184x(17+83) =184x100 =18400 981+5x9810+49x981 =981x1+981x10x5+981x49 =981x1+981x50+981x49 =981x(1+50+49) =981x100 =98100

5.7÷17≈0.335≈0.34 竖式见图:

3.19÷17=0.18 竖式见图:

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