Question

(на фото) алгебра 7 клас
(⁠?⁠・⁠・⁠)⁠σ​

Answer 1

$\frac{x - 1}{5} + \frac{x - 2}{3} = 2 - \frac{x - 2}{15} \\ \frac{3(x - 1)}{5 \times 3} + \frac{5(x - 2)}{3 \times 5} = \frac{2 \times 15}{15} - \frac{x - 2}{15} \\ \frac{3x - 3 + 5x - 10}{15} = \frac{30 - x + 2}{15} \\ 8x - 13 = 32 - x \\ 8x + x = 32 + 13 \\ 9x = 45 \\ x = \frac{45}{9} = 5$

Answer 2

Ответ:

$\frac{x - 1}{5} + \frac{x - 2}{3} + \frac{x - 2}{15} = 2 \\ \frac{3x - 3 + 5x - 10 + x - 2}{15} =2 \\ \frac{9x - 15}{15} =2 \\ 9x - 15 = 2 \times 15 \\ 9x = 30 + 15 \\ 9x = 45 \\ x = 45 \div 9 \\ x = 5$