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420除以3列竖式并验算

420÷3=140竖式如下:

420÷3=140

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

420÷3=120.它的除法竖式计算如下:

3√420 3 12 12 0

(1)380÷54=7…2; (2)492÷24=20…12; (3)420÷35=12;

3÷4列竖式计算3÷4=0.75有用请采纳.

14.7除以420,列竖式计算,并用乘法验算.14.7÷420=0.035,验算:420*0.035=14.7.

420÷(3*2)=420÷6=70 验算70*(3*2)=70*6=420

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