2/3乘(9/16-1/4)+1/3乘5/16=多少

问题描述:

2/3乘(9/16-1/4)+1/3乘5/16=多少

原式=2/3X5/16+1/3X5/16
=(2/3+1/3)X5/16
=1X5/16
=5/16