Question

1.Решите уравнения:а). 3х + 2,7 = 0;б). 2х + 7 = 3х – 2( 3х – 1 )в). 2x/5=x-3/2

Answer 1

$a)3x + 2.7 = 0$

$3x = 0 - 2.7$

$3x = - 2.7$

$x = - \frac{2.7}{3} = - 0.9$

$x = - 0.9$

Ответ : - 0.9

$b)2x + 7 = 3x - 2 \times (3x - 1)$

$2x + 7 = 3x - 6x + 2$

$2x - 3x + 6x = 2 - 7$

$5x = - 5$

$x = - \frac{5}{5} = - 1$

$x = - 1$

Ответ : - 1

$v) \frac{2x}{5} = \frac{x - 3}{2}$

$2x \times 2 = (x - 3) \times 5$

$4x = 5x - 15$

$4x - 5x = - 15$

$- x = - 15$

$x = 15$

Ответ : 15