3/4*40%+0.75*3/5简便计算

问题描述:

3/4*40%+0.75*3/5简便计算

3/4*40%+0.75*3/5
=0.75x2/5+0.75x3/5
=0.75x(2/5+3/5)
=0.75x1
=0.75