Question

Помогите решить всё
За 16 минут

Answer 1

$1)(3 - 5.8x) - (2.2x + 3) = 16 \\ 3 - 5.8x- 2.2x - 3 = 16 \\ - 8x = 16 \\ x =- \frac{16}{8} \\ x =- 2$

$2)(4- 8.2x) - (3.8x + 1) = 5 \\ 4- 8.2x - 3.8x - 1 = 5 \\ 3 - 12x = 5 \\ - 12x = 2 \\ x = - \frac{2}{12} = - \frac{1}{6}$

$3) - 8x + (4 + 3x) = 10 - x \\ - 8x + 4 + 3x = 10 - x \\ - 4x = 6 \\ x = - \frac{6}{4} = - \frac{3}{2} = 1.5$

$4)x { }^{2} - 11x = 0 \\ x(x - 11) = 0 \\ x_{1} = 0 \: \: \: x_{2} - 11 = 0 \\ x_{1} = 0 \: \: \: x_{2} = 11$

$5)(5n - 1) + (9n - 20) = 5n - 1+ 9n - 20 = 14n - 21 = 7(2n - 3)$

$6)(2n - 1) + (13n + 13) = 2n - 1 + 13n + 13 = 15n + 12 = 3(5n + 4)$

Answer 2

Уравнения:

$(3 - 5.8x) - (2.2x + 3) = 16 \\ - 8x = 16 \\ x = - 2 \\ \\ (4 - 8.2x) - (3.8x + 1) = 5 \\ - 12x = 2 \\ x = - \frac{1}{6} \\ \\ - 8x + (4 + 3x) = 10 - x \\ -4x = 6 \\ x = -\frac{6}{4} \\ x = -1.5 \\ \\ {x}^{2} - 11x = 0 \\ x(x - 11) = 0 \\ \\ x = 0 \\ x = 11$

Доказательства, что делится:

$(5n - 1) + (9n - 20) = 14n - 21 = 7(2n - 3) \\ \frac{7(2n - 3)}{7} = 2n - 3 \\ \\ (2n - 1) + (13n + 13) = 15n + 12 = 3(5n + 4) \\ \frac{3(5n + 4)}{3} = 5n + 4$