3/7×1/4+25%×2/7+0.25×1/7简便算法

问题描述:

3/7×1/4+25%×2/7+0.25×1/7简便算法

3/7×1/4+25%×2/7+0.25×1/7
=3/7×1/4+1/4×2/7+1/4×1/7
=1/4×(3/7+2/7+1/7)
=1/4×6/7
=3/14