(3/4+2/5-3/10)x20用递等式计算,能简算的要简算 日期:2016-06-08 01:26:41 人气:1 (3/4+2/5-3/10)x20用递等式计算,能简算的要简算 由题意,得: (3/4+2/5-3/10)x20 =3x20/4+2x20/5-3x20/10 =15+8-6 =23-6 =17