五年级数学《小数乘除法简便运算》专项训练
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简介
一、乘法交换律（基础凑整） 12.5×5.9×0.8 =12.5×0.8×5.9 =10×5.9 =59 2.5×0.27×4 =2.5×4×0.27 =10×0.27 =2.7 0.25×7.6×4 =0.25×4×7.6 =1×7.6 =7.6 2.5×4.9×4 =2.5×4×4.9 =10×4.9 =49 0.25×10.3×4 =2.5×4×4.9 =10×4.9 =49 2.5×0.8×4 =2.5×4×0.8 =10×0.8 =8 二、乘法结合律（连乘凑整） 13.2×4×0.25 =13.2×(4×0.25) =13.2×1 =13.2 52×0.5×2 =52×(0.5×2) =52×1 =52 45×0.5×2 =45×(0.5×2) =45×1 =45 7.81×12.5×8 =7.81×(12.5×8) =7.81×100 =781 9.46×2×0.5 =9.46×(2×0.5) =9.46×1 =9.46 88×0.25×4 =88×(0.25×4) =88×1 =88
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