五年级上册数学《小数乘除法》简便计算专项训练
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简介
2.5×3.8×0.4 =2.5×0.4×3.8 =1×3.8 =3.8 4.8÷0.25÷4 =4.8÷(0.25×4) =4.8÷1 =4.8 7.2÷1.25÷0.8 =7.2÷(1.25×0.8) =7.2÷1 =7.2 1.5×102 =1.5×(100+2) =1.5×100+1.5×2 =150+3 =153 7.2÷4.5 =7.2÷(0.9×5) =7.2÷0.9÷5 =8÷5 =1.6 5.2×9.9+0.52 =5.2×9.9+5.2×0.1 =5.2×(9.9+0.1) =5.2×10 =52
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