这道六年级分数简便计算怎么做? 200
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99×2/5+99------------反用乘法对加法的分配率,提取99
=99(2/5+1)---------99变为100-1,便于简单计算,2/5变成小数0.4
=(100-1)×1.4-------用乘法对减法的分配率
=140-1.4
=138.6 即138又5分之3
=99(2/5+1)---------99变为100-1,便于简单计算,2/5变成小数0.4
=(100-1)×1.4-------用乘法对减法的分配率
=140-1.4
=138.6 即138又5分之3
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简便计算过程如下
99×2/5+99
=99×2/5+99×1
=99×(2/5+1)
=99×(2/5+5/5)
=99×7/5
=(100-1)×7/5
=100×7/5-1×7/5
=140-7/5
=140-(5/5+2/5)
=140-(1+2/5)
=140-1-2/5
=139-2/5
=139-0.4
=138.6
望采纳
99×2/5+99
=99×2/5+99×1
=99×(2/5+1)
=99×(2/5+5/5)
=99×7/5
=(100-1)×7/5
=100×7/5-1×7/5
=140-7/5
=140-(5/5+2/5)
=140-(1+2/5)
=140-1-2/5
=139-2/5
=139-0.4
=138.6
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99×2/5+99
=99×(2/5+1)
=99×7/5
=(100-1)×7/5
=140-7/5
=140-1-2/5
=138又3/5。
=99×(2/5+1)
=99×7/5
=(100-1)×7/5
=140-7/5
=140-1-2/5
=138又3/5。
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99×2/5+99
=99×(2/5+1)
=(100-1)×7/5
=100×7/5-7/5
=140-7/5
=138又3/5
=99×(2/5+1)
=(100-1)×7/5
=100×7/5-7/5
=140-7/5
=138又3/5
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简便计算过程如下
99×2/5+99
=99×2/5+99×1
=99×(2/5+1)
=99×(2/5+5/5)
=99×7/5
=(100-1)×7/5
=100×7/5-1×7/5
=140-7/5
=140-(5/5+2/5)
=140-(1+2/5)
=140-1-2/5
=139-2/5
=139-0.4
=138.6
望采纳
99×2/5+99
=99×2/5+99×1
=99×(2/5+1)
=99×(2/5+5/5)
=99×7/5
=(100-1)×7/5
=100×7/5-1×7/5
=140-7/5
=140-(5/5+2/5)
=140-(1+2/5)
=140-1-2/5
=139-2/5
=139-0.4
=138.6
望采纳
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