0,5: 1 1/4 + 1 2/5 : 1 4/7 - 3/11--------------------------------------- = (1,5 + 1/4) : 2 13/320,5: 1,25 + 7/5 : 11/7 - 3/11--------------------------------------- = (1,5 + 0,25) : 77/320,4 + 7/5 * 7/11 - 3/11--------------------------------------- = 1,75 : 77/320,4 + 49/55 - 15/55--------------------------------------- = 1 75/100 : 77/324/10 + 34/55--------------------------------------- = 1 75/100 : 77/322/5 + 34/55--------------------------------------- = 175/100 : 77/3222/55 + 34/55--------------------------------------- =175/100 * 32/7756/55--------------------------------------- = 175/25 * 8/7756/55--------------------------------------- =25/25 * 8/1156/55--------------------------------------- = 56/55:8/11=56/55*11/8=7/55*11/1=7/5*1/1=8/11=7/5=1,41,4/35*100=4