Question

奥数题 0.5×0.32×1.25×0.025×0.2 明写过程，谢谢

Answer 1

其实，在乘法运算中，有些数也是可以组成朋友的，比如2和5，乘积椒10；4肯25，乘积是100，8和125，乘积是1000等，此题已经有2与5（不考虑小数点），125与25缺少8和4，而恰好有32可以分成8和4，所以0.5x0.32x1.25x0.025x0.2=（0.5x0.2）x（0.8x1.25）x（0.4x0.025）=0.1x1x0.01=0.001。

Answer 2

0.5x0.32x1.25x0.025x0.2
=0.5x0.4x0.8x1.25x0.025x0.2
=（0.5x0.2）x（0.4x0.025）x（0.8x1.25）
=0.1x0.01x1
=0.001

Answer 3

解：原式=0.5×0.4 ×0.8×1.25×0.5×0.05×0.2
=0.2×1×0.1×0.05
=0.2×0.005
=0.001

Answer 4

原式
=0.5×0.2×0.8×1.25×0.4×0.025
=0.1×1×0.01
=0.001