91 целая 1/6+ 3 целых 5/18 г) 39целых 5/6 + 12целых5/9

91 1/6 + 3 5/18 = 94 + (1/6 + 5/18) = 94 + (3/18 + 5/18) = 94 8/18 = 94 4/9
г) 39 5/6 + 12 5/9 = 51 +(5/6 + 5/9) = 51 + (15/18 + 10/18) = 51 + 25/18 = 52 7/18

91 целая 1/6+3целих 5/18=91 целая 3/18+3целих 5/18=90це90ц елих18/18+3/18-3целих5/18=90целих 21/18-3целих5/18=87целих16/18=87целих8/9