Вправи 1201 - 1300 » 1265 (3-4)

3) 78/19 – (81/19 – х) = 310/19 81/19 – х = 78/19 – 310/19 81/19 – х = 627/19 – 310/19 81/19 – х = 317/19 х = 81/19 – 317/19 х = 720/19 – 317/19 х = 43/19 4) 54/7 + (46/7 + х) = 103/7 46/7 + х = 103/7 – 54/7 46/7 + х = 910/7 – 54/7 46/7 + х = 46/7 х = 46/7 – 46/7 х = 0