Ответы на вопрос:
6 6/10 * 3/4 : 2 2/5 * 2 1/5 = 4 43/80
1) 6 6/10 * 3/4 = 66/10 * 3/4 = 198/40 = 4 38/40 = 4 19/20
2) 4 19/20 : 2 2/5 = 99/20 : 12/5 = 99/20 * 5/12 = 99/48 = 2 3/48 = 2 1/16
3) 2 1/16 * 2 1/5 = 33/16 * 11/5 = 363/80 = 4 43/80
7y + 5 - 8 = 5y - 2
7y - 5y = 8 - 5 - 2
2y = 1
y = 1/2
y = 0,5
•Проверка:{✓}
7 • 0,5 + 5 - 8 = 5 • 0,5 - 2
3,5 + 5 - 8 = 2,5 - 2
- 0,5 = - 0,5 ✔️✔️✔️
15х + 2 - 7х = 8х - 5 - 7х
15х - 8х + 7х = -5 - 2
16х = -7
х = -7/16
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