Question

4. Решите уравнения:
надо​

Answer 1

1) 5х+48:4=20:10-2*10

5х+12=2-20

5х+12= -18

5х= -18-12

5х= -30

х=-6

2) 7х+32:2=(72+18):3

7х+16=90:3

7х+16=30

7х=30-16

7х=14

х=2

3)

$4 \times \frac{1}{2} x + 3 \times \frac{3}{10} \times 5 = 7 \times \frac{6}{13} + 18 \times \frac{7}{13}$

$\frac{9}{2} x + \frac{33}{10} \times 5 = (7 + 18) + ( \frac{6}{13 } + \frac{7}{13} )$

$\frac{9}{2} x + \frac{33}{10} \times 5 = 25 + 1$

$\frac{9}{2} x + \frac{33}{2} = 26$

9х+33=52

9х= 52-33

9х=19

$x = \frac{19}{9}$