79*3/80简算 还有(3/5-3/5)*20简算

问题描述:

79*3/80简算 还有(3/5-3/5)*20简算

79*3/80 = (79+1)*3/80-3/80 = 3-3/80 = 237/80
(3/5-3/5)*20 = 0*20 = 0