2/3x-1/5x=3.6-1.52/3x-1/5x=2.1两边同时乘以15x,得到:2*5-3=2.1*15x10-3=31.5xx=7/31.5=14/63=2/9
化简啊... 2/3x-1/5x=3.6-1.5 得 10/15x-3/15x=2.1 7/15x=2.1 x=2.1*15/7 x=4.5
10/15 x -3/15 x=7/15 x=3.6-1.5=2.11/15 x=0.3=3/10(两边都除以7)2/30 x=9/302x=9 (两边都乘以30)x=4.5
7/15X=2.1,X=4.5
3.6×二分之一-5分之三X等于一又五分之一解答怎样