五年级上册数学《小数乘除法》口算计算简便运算
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简介
二、小数乘法简便计算 6.59×2.45+7.55×6.59 =6.59×(2.45+7.55) =6.59×10 =65.9 1.25×4.6×8 =(1.25×8)×4.6 =10×4.6 =46 8.4×2.4+2.4×1.6 =2.4×(8.4+1.6) =2.4×10 =24 19.28×101-19.28 =19.28×(101-1) =19.28×100 =1928 三、小数除法简便计算 a÷(b÷c)=a÷b×c 3.9÷(1.3÷5) =3.9÷1.3×5 =3×5 =15 a÷b×c=a÷(b÷c) 16.8÷4.8×2.4 =16.8÷(4.8÷2.4) =16.8÷2 =8.4
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