( 11 целых 3/10 - 8 целых 7/9) : 7 целых 17/30 решите уравнения
1) 11 3/10 - 8 7/9 = 113/10 - 79/9 = (113 × 9 - 79 × 10)/90 = 1017/90 - 790/90 = 227/90 = 2 47/90 2)2 47/90 : 7 17/30 = 227/90 : 227/30 = 227/90 * 30/227 =6810/20430 = 1/3