12 4/5* 3 3/4-4 4/11* 4 1/8 = 180-18 = 162 = 5 4 = 5,4 11 2/3:7/18 30 30 10 12 4/5* 3 3/4=240/5*15/4=60/1*3/1=180/1=180 4 4/11* 4 1/8=48/11*33/8=6/1*3/1=18/1=18 11 2/3:7/18=35/3:7/18=35/3*18/7=5/1*6/1=30/1=30 180-18=162 162/30=5 12/30= 5 4/10= 5,4