五上数学小数乘法简便运算 八大经典题型
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简介
（一）顺展型 (4.0+0.4)×25 =4.0×25+0.4×25 =100+10 =110 （二）逆合型 3.6×6.3+3.6×3.7 =3.6×(6.3+3.7) =3.6×10 =36 （三）拆加型 2.04×2.5 =(2+0.04)×2.5 =2×2.5+0.04×2.5 =5+0.1 =5.1 （四）拆减型 4.5×9.9 =4.5×(10-0.1) =4.5×10-4.5×0.1 =45-0.45 =44.55
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