Question

Помогите решить уравнение умоляю мама прибьет

Answer 1

$a)3.5(x - 3) - 0.7(7 - x) = - 7 \\ 3.5x - 10.5 - 4.9 + 0.7x = - 7 \\ 4.2x - 15.4 = - 7 \\ 4.2x = 8.4 \\ x = 2$

$b) \frac{x - 1}{5} + \frac{x - 2}{3} = 2 - \frac{x - 2}{15} \\15 \times ( \frac{x - 1}{5} + \frac{x - 2}{3} ) = 15 \times (2 - \frac{x - 2}{15} ) \\ 3x - 3 + 5x - 10 = 30 - x + 2 \\ 8x - 13 = 32 - x \\ 9x = 36 \\ x = 4$

$c)\frac{3m + 5}{4} = \frac{5m + 1}{3} \\ 3(3m + 5) = 4(5m + 1) \\ 9m + 15 = 20m + 4 \\ 11m = 11 \\ m = 1$

$d) |x + 1| = 2 \\ x + 1 = 2 \\ x = 1 \\ x + 1 = - 2 \\ x = - 3$

$e)x(2x - 3) = 0 \\ x = 0 \\ 2x - 3 = 0 \\ 2x = 3 \\ x = 1.5$