79*3/80简算还有(3/5-3/5)*20简算_数学解答

79*3/80简算还有(3/5-3/5)*20简算

人气：458 ℃　时间：2020-03-21 07:36:26

解答

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