Question

Помогите даю 45б математика

Answer 1

Ответ:

$1)13(x - 13) + 14(14x - 2) = 11(3x - 11) + 28 + (10x - 21) \\ 13x - 169 + 196x - 28 = 33x - 121 + 28 + 10x - 21 \\ 209x - 197 = 43x - 114 \\ 209x - 43x = - 114 + 197 \\ 166x = 83 \\ x = \frac{1}{2}$

$2)17 (5 + x) - 20x = 8x - 14 \\ 85 + 17x - 20x = 8x - 14 \\ 85 - 3x = 8x - 14 \\ - 3x - 8x = - 14 - 85 \\ - 11x = - 99 \\ x = 9$

$3) - 15(4y - 3) + 37y = 42y - 111 \\ - 60 + 45 + 37y = 42y - 111 \\ - 23y + 45 = 42y - 111 \\ - 23y - 42y = - 111 - 45 \\ - 65y = - 156 \\ y = \frac{12}{5} \\ y = 2 \frac{2}{5}$

$4)18(18 - x) - 20(2x + 20) - 8 = 19(19 - 3x) - 25(x + 25) \\ 324 - 18x - 40x - 400 - 8 = 361 - 57x - 25x - 625 \\ - 84 - 58x = - 264 - 82x \\ - 58x + 82x = - 264 + 84 \\ 24x = - 180 \\ x = - \frac{15}{2} \\ x = - 7 \frac{1}{2}$

$5) \frac{x + 3}{4} + \frac{2x - 1}{6} = \frac{7}{3} \\ 12( \frac{x + 3}{4} + \frac{2x - 1}{6} ) = 12 \times \frac{7}{3} \\ 12 \times \frac{x + 3}{4} + 12 \times \frac{2x- 1}{6} = 12 \times \frac{7}{3} \\ 3(x + 3) + 2(2x - 1) = 28 \\ 3x + 9 + 4x - 2 = 28 \\ 7x + 7 = 28 \\ 7x = 28 - 7 \\ 7x = 21 \\ x = 3$

готово :)