商不变,用简便方法计算。800除以257000除以1256000除以244800除以64
800÷25
=(800×4)÷(25×4)
=3200÷100
=32
7000÷125
=(7000×8)÷(125×8)
=56000÷1000
=56
6000÷24
=6000÷6÷4
=1000÷4
=250
4800÷64
=4800÷8÷8
=600÷8
=75
800÷25
=(800×4)÷(25×4)
=3200÷100
=32
7000÷125
=(7000×8)÷(125×8)
=56000÷1000
=56
6000÷24
=(6000÷6)÷(24÷6)
=1000÷4
=250
4800÷64
=(4800÷8)÷(64÷8)
=600÷8
=(600÷2)÷(8÷2)
=300÷4
=75
800/25=(800*4)/(25*4)=3200/100=32
7000/125=(7000*8)/(125*8)=56000/1000=56
6000/24=6000/6/4=1000/4=250
4800/64=4800/8/8=600/8=75
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