四年级数学上册用商的变化规律简便计算

四年级数学上册用商的变化规律简便计算


简介:
①3750÷25 =(3750÷5)÷(25÷5) =750÷5 =150 ③1200÷50 =(1200×2)÷(50×2) =2400÷100 =24; ⑤600÷25 =(600×4)÷(25×4) =2400÷100 =24 ⑦8000÷125 =(8000×8)÷(125×8) =64000÷1000 =64 . ⑨450÷18 =(450÷9)÷(18÷9) =50÷2 =25