简便计算。例子:325÷25
=(325×4)÷(25×4)
=1300÷100
=13
(1)49500÷900 (2)9000÷225
49500÷900
=(495×100)÷(9×100)
=495÷9
=55
9000÷225
=(9000*4)÷(225*4)
=36000÷900
=40
=(495×100)÷(9×100)
=495÷9
=55
9000÷225
=(9000*4)÷(225*4)
=36000÷900
=40
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