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420 40的竖式并验算

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

各位对各位10位对10位

420除以40=10.5

450除以40列竖式,并验算450÷40=11…10 验算:40*11+10=440+10=450

(1)420÷5=84 845 420 40 . 20 20 . 0 验算 84 * 5 . 420 (2)945÷45=21 2145 945 90 . 45 45 . 0 验算: 45 * 21 . 45 90 . 945

420÷45=9……15

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

620/40竖式计算并验算620÷40=15.5验算:15.5*40=620或:620÷15.5=40

1800÷40=45验算:420÷60=7验算:1200÷240=5验算:

3.92 * 9.07 2744 35 28=35.5544

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