1)) 3ц 1/8+ 2ц 1/7= (8•3+1)/8+ (7•2+1)/7= 25/8+ 15/7= (25•7)/(8•7)+ (15•8)/(7•8)= 175/56+ 120/56= 295/56= (5•56+15)/56= 5целых 15/56. _____ 2)) 5ц 1/6+ 1ц 2/3= (6•5+1)/6+ (3•1+2)/3= 31/6+ 5/3= 31/6+ (5•2)/(3•2)= 31/6+ 10/6= 41/6= (6•6+5)/6= 6целых 5/6.