76/5-31/5+63/11.' 212/23-23/7+97/23 '.37/11+47/9-41/9.' 81/5:(-9/2)x(-5/18)-9.' 11/7+19/8+46/15+5/8+52//7 помогите решить нужно очень срочно

вообще ничего не понятно

1 - 8/15 = 15/15 - 8/15 = 7/15,3 - 2/11 = 33/11 - 2/11 = 31/11 = 2 9/11,4 - 3 4/9 = 3 9/9 - 3 4/9 = 5/9,7 3/8 - 5 = 2 3/8,45 - 44 3/8 = 44 8/8 - 44 3/8 = 5/8,6 7/15 - 3 1/5 = 6 7/15 - 3 3/15 = 3 4/15,10 3/23 - 7 19/46 = 10 6/46 - 7 19/46 = 9 52/46 - 7 19/46 = 2 33/46,16 2/5 - 4 3/7 = 16 14/35 - 4 15/35 = 15 49/35 - 4 15/35 = 11 34/35,19 5/12 - 8 17/18 = 19 15/36 - 8 34/36 = 18 51/36 - 8 34/36 = 10 17/36