Пошаговое объяснение:
2. 1/5 + х = 5. 3/5
х = 5. 3/5 - 2. 1/5
х = 3. 2/5
2. 5/7 + х = 7
х = 7 - 2. 5/7
х = 6. 7/7 - 2. 5/7
х = 4. 2/7
12 - х = 15/17
х = 12 - 15/17
х = 11. 17/17 - 15/17
х = 11. 2/17
4 + х = 4. 3/7
х = 4. 3/7 - 4
х = 3/7
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Пошаговое объяснение:
2. 1/5 + х = 5. 3/5
х = 5. 3/5 - 2. 1/5
х = 3. 2/5
2. 5/7 + х = 7
х = 7 - 2. 5/7
х = 6. 7/7 - 2. 5/7
х = 4. 2/7
12 - х = 15/17
х = 12 - 15/17
х = 11. 17/17 - 15/17
х = 11. 2/17
4 + х = 4. 3/7
х = 4. 3/7 - 4
х = 3/7