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420除以8的竖式计算

420÷2=210

1/4+1/12+1/24+1/40+1/60+1/84+1/112 =1/2*(1/2+1/6+1/12+1/20+1/30+1/42+1/56) =1/2*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8) =1/2*(7/8) =7/16

7

400除以8的三步竖式400除以8=40÷8*10=5*10=50

420÷4=105 竖式如下

420÷6=70747÷8=93…349*78=382250*58=2900526÷4=131…2验算:28*17=476验算:305*9=2745验算:

420除以6的竖式420÷6=70有用请采纳.

856÷4=214验算:404÷5=80…5验算:880÷8=110验算:202÷2=101验算:420÷3=140验算:203÷5=40…3验算:

3÷4列竖式计算3÷4=0.75有用请采纳.

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