а) (4/9) : (3/8) = (4/9) * (8/3) = 32/27
б) (3/7) : (9/14) = (3/7) * (14/9) = 2/3
в) (86/113) : (43/51) = (86/113) * (51/43) = 2/3
г) (27/64) : 9 = (27/64) * (1/9) = 3/64
д) 8 : (2/3) = 8 * (3/2) = 12
е) 7 : 3 = 7/3
ж) (2 1/7) : (1 11/14) = (15/7) : (25/14) = (15/7) * (14/25) = 42/25
з) (3 3/5) : (1 11/25) = (18/5) : (36/25) = (18/5) * (25/36) = 125/10 = 12.5
а) (4/9) : (3/8) = (4/9) * (8/3) = 32/27
б) (3/7) : (9/14) = (3/7) * (14/9) = 2/3
в) (86/113) : (43/51) = (86/113) * (51/43) = 2/3
г) (27/64) : 9 = (27/64) * (1/9) = 3/64
д) 8 : (2/3) = 8 * (3/2) = 12
е) 7 : 3 = 7/3
ж) (2 1/7) : (1 11/14) = (15/7) : (25/14) = (15/7) * (14/25) = 42/25
з) (3 3/5) : (1 11/25) = (18/5) : (36/25) = (18/5) * (25/36) = 125/10 = 12.5