§ 5. Звичайні дроби » 1078

Розв’яжіть рівняння: 1) х + 21/7 = 56/7 х = 56/7 – 21/7 х = (5 – 2) + (6/7 – 1/7) х = 35/7 35/7 + 21/7 = 56/7 (3 + 2) + (5/7 + 1/7) = 56/7 56/7 = 56/7 2) 44/9 – х = 15/9 х = 44/9 – 15/9 х = (3 – 1) + (13/9 – 5/9) х = 28/9 44/9 – 28/9 = 15/9 (3 – 1) + (13/9 – 8/9) = 15/9 15/9 = 15/9 2) х – 34/5 = 23/5 х = 23/5 + 34/5 х = (2 + 3) + (3/5 + 4/5) х = 57/5 = 62/5 62/5 – 34/5 = 23/5 (5 – 3) + (7/5 – 4/5) = 23/5 23/5 = 23/5