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简介：
五年级数学下册
《分数的简便计算》六大常考题型
类型一7 + 3.8 - 4 类型四1.46x+2.54x
=7 - 4 + 3.8 =x(1.46+2.54)
=3+3.8 =x4
=6.8 =
类型二 12 - 7 + 5 类型五18x( + - )
=12 - (7 - 5) =18x +18x -18x
=12 -2 =2+6-3
=10 =5
类型三0.125x32x2.5 类型六 x48
=0.125x8x4x2.5 = x(47+1)
=1x10 = x47 + x1
=10 =46
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