Ответы на вопрос:
21/7: х=2,5 15/7: х=5/2 х=15/7: 5/2 х=6/7 х-8 7/9=5/18 х=5/18+8 7/9 х=5/18+8 14/18 х=8 19/18 х=9 1/18
Пошаговое объяснение:
№1
А)
1) 9/35 - 3/28 = 36/140 - 15/140 = 21/140 = 3/20
2) 7/20 - 3/20 = 4/20 = 1/5
Б)
1) 21/22 - 5/11 = 21/22 - 10/22 = 11/22 = 1/2
2) 22/39 - 3/13 = 22/39 - 9/39 = 13/39 = 1/3
3) 1/2 - 1/3 = 3/6 - 2/6 = 1/6
№2
А)
1/2 + х = 5/6
х = 5/6 - 1/2
х = 5/6 - 3/6
х = 2/6
х = 1/3
Б)
у - 1/5 = 3/10
у = 3/10 + 1/5
у = 3/10 + 2/10
у = 5/10
у = 1/2
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