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(3/4-1/6)*3/7=(18/24-4/24)*3/7=14/24*3/7=7/12*3/7=(сокращаем 7и7 и 3и 12) 1/4
(4/15+2/3):2/5= (4/15+10/15)*5/2=14/15*5/2=(сокращаем 14 и 2, 15 и 5) =7/3
(4/8+1/6)*9/11=(12/24+4/24)*9/11=16/24*9/11= 16/3*3/11= 48/33= 1 15/33= 1 5/11