五年级上册数学易错计算题 小数乘除法简便运算
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简介
6.8×2.7+2.7×3.2 =2.7×(6.8+3.2) =2.7×10 =27 4.8÷2.5÷4 =4.8÷(2.5×4) =4.8÷10 =0.48 7.25÷1.25÷8 =7.25÷(1.25×8) =7.25÷10 =0.725 0.38×102 =0.38×(100+2) =0.38×100+0.38×2 =38+0.76 =38.76 1.25×9.36×8+0.78 =1.25×8×9.36+0.78 =10×9.36+0.78 =93.6+0.78 =94.38 12.5×3.2×2.5 =12.5×0.8×4×2.5 =(12.5×0.8)×(4×2.5) =10×10 =100
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