43.875*1/2+57.125*20%-0.5简便运算怎么算?

问题描述:

43.875*1/2+57.125*20%-0.5简便运算怎么算?

43.875*1/2+57.125*50%-0.5
=(43.875+57.125-1)*0.5
=100*0.5
=5050%从哪来的呢?题目有误,修改过的