Question

0.4×0.2×0.8×1.25×0.25×5怎么简便？

Answer 1

简便算法可以这样算，式子＝0.8×1.25×0.25×0.4=1×0.1=0.1。
乘法的结合率运算简单=（0.8x1.25）x（0.25x0.4）=1x0.1=0.1
=8×125×25×4×0.000001=1000×100×0.00001=0.1
0.8×0.25×0.4×1.25的简便计算为：=（0.8x0.25）x（0.4x1.25）=0.2x0.5=0.1
0.8×0.25×0.4×1.25＝（0.25×0.4）×（0.8×1.25）＝0.1×1＝0.1

Answer 2

0.4×0.2×0.8×1.25×0.25×5
=0.4×0.25×（0.2×5）×（0.8×1.25）
根据4×25=100，2×5=10，8×125=1000和乘法交换律、结合律。
=0.1×1×1
=0.1

Answer 3

简便算法可以这样算，式子＝0.8×1.25×0.25×0.4=1×0.1=0.1。

Answer 4

· 五年级数学上册运用四则混合运算定律练习题 一、用递等式计算。3.83×4.56＋3.83×5.44 4.36×12.5×89.7×99＋9.7 27.5×3.7－7.5×3.78.54÷2.5÷0.4 0.65×101二、用简便方法计算。3.2×0.25×12.5 3.14×0.68＋31.4×0.0325.6÷1.25÷0.8÷2.5÷0.4 7.2×0.2＋2