Question

помогите решить уравнениеэя а и б​

Answer 1

$\frac{x - 3}{6} = \frac{7}{3}$

$6 \times 7 = (x - 3) \times 3$

$42 = 3x - 9$

$3x = 42 + 9$

$3x = 51$

$x = 17$

$\frac{5}{2x + 3} = \frac{2.5}{4.5}$

$2.5 \times( 2x + 3) = 4.5 \times 5$

$5x + 7.5 = 22.5$

$5x = 22.5 - 7.5$

$5x = 15$

$x = 3$

Answer 2

1) (х-3)/6=7/3

(х-3)×3=42 - пропорция

3х-9=42

3х=51

х=17 - ответ

2) 5/(2х+3)=2.5/4.5

5/(2х+3)=25/45

5/(2х+3)= 5/9

45= 10х+15

10х= 30

х=3 - ответ