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四年级下册数学【小数简便计算】专项训练
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2024-05-20
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四年级下册数学【小数简便计算】专项训练


简介：
0.25×36 0.25×0.73×4 =0.25×4×9 =0.25×4×0.73 =1×9 =1×0.73 =9 =0.73 (拆数，乘法结合律) (乘法交换律和乘法结合律) 12.7-(3.7+0.84) 36.54-1.76-4.54 =12.7-3.7-0.84 =36.54-4.54-1.76 =9-0.84 =32-1.76 =8.14 =30.24 (减法的性质) (减法交换) 7.6×0.8+0.2×7.6 0.25×8.5×4 =7.6×(0.8+0.2) =0.25×4×8.5 =7.6×1 =1×8.5 =7.6 =8.5 (乘法分配律) (乘法交换律和乘法分配律) 1.28×8.6+0.72×8.6 12.5×0.96×0.8 =(1.28+0.72)×8.6 =12.5×0.8×0.96 =2×8.6 =10×0.96 =17.2 =9.6 (乘法分配律) (乘法交换律和乘法结合律)