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竖式计算. 840×8= 70÷9

840÷8=105,竖式如图:

544÷8=6880×45=3600*615÷4=153…3验算:840÷8=10585×34=2890*605÷4=151…1验算:

200÷4=50630÷3=21032×20=640742÷7=10610×0=040×20=80050×11=550240÷2=12020×70=1400840÷8=105360÷3=120800÷4=2000÷32=050×20=1000 600÷2=30023×2=461.9+3.4=5.32.7-1.8=0.99.4+0.6=1015.6-0.8=14.8

791÷7=113; 11377917 9 7 21 21 0209÷3=69…2; 69320918 29 27 2840÷5=168; 16858405 3430 40 40 0562÷4=140…2; 14045624 16 16 2824÷8=103; 103 88248 24 24 0验算:103 ×8824,846÷6=141; 14168466 24 24 6 60,验算:141 ×6846.

(1)48×9+48=432+48=480;48×(9+1)=48×10=480;480=480,所以:48×9+48=48×(9+1).(2)840÷12-8=70-8=62;840÷(12-8)=840÷4=210;62<210,所以840÷12-8<840÷(12-8);(3)(65+25)×4=90×4=360;65+25×4=65+100=165;360>165,所以...

486÷3=162*469÷8=58…5760÷8=95624÷6=104675÷7=96…3209÷4=52…1*840÷7=120318÷3=106

300÷125÷8=300÷(125×8)=300÷1000=0.3 396-96-172-28 =(396-96)-(172+28)= 300-200 = 100 125*24 = 125*8*3 = 1000*3 = 3000 26*15 = (20+6)*15 = 20*15 + 6*15 = 300+90 =390 25*99*4 = 25*4*99 = 100*99 = 9900 250*32 = 250*4*8 = 100...

300×5=1500, 840÷4=210, 420×1=420, 96÷3=32, 600×4=2400, 630÷9=70, 99×2=198, 86+7=93, 120÷5=24, 0÷9=0, 700÷7=100, 50×3=150, 80×4=320, 56×3=168, 30÷2=15, 3 8 + 4 8 = 7 8 , 5 7 - 3 7 = 2 7 , 3 5 + 2 5 =1, 9 9 - 6...

30×30=900 720÷9=80 56×10=560 400÷8=50 840÷4=210 48÷4=12 42×20=840 25×6=150 4.3-2.8=1.5 0.7+0.8=1.5 5-3.6=1.4 2.6+3.9=6.5

40×3=120 500×2=1000 400×5=2000 75÷8=9…3 200-178=22 210×4=840 789×0=0 389+470=859 302×3=906 25×4=100 16×2=32 27÷9=3 65-7=58 760+0=760 103×5≈500 299×4≈1200 6×7+8=50 3 9 + 2 9 = 5 9 2 7 + 5 7 =1 1- 2 3 = 1 3 12 12 - 3 8 + 1 8 = 3 4

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