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312除以52的竖式有验算

312÷52=6

312/52=(52x6)/52=6 得到的结果为652x6=(50+2)x6=300+12=312

312÷52=697÷31=3…4783÷87=9验算:832÷19=43…15验算:

____6_ 52/312 3 1 2  ̄ ̄ ̄ ̄ ̄0 ̄ ̄ ̄ ̄

312÷12=156÷6=52÷2=26312÷12=26

350/52=(312+38)/52=6+38/52 ≈6.73 商是6,余数为38

312÷53=5余47

解;1900/52=36.53=36.536.5x52=1898 误差/(1898-1900)/1900/=2/1900=0.00105=0.105%<5%.验算正确.

12除以52怎么验算12/52=0……12验算:52*0+12=0+12=12

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