Question

va rog ,este urgent ,mulțumesc ​

Answer 1

Explicație pas cu pas:

5. a+b=38

a-b=8 => a=b+8

b+8+b=38

2b+8=38

2b=38-8

2b=30

b=30:2

b=15

a=b+8

a=15+8

a=23

6. 3(2x-5)+13=2(x+4)+7

6x-15+13=2x+8+7

6x-2=2x+15

6x-2x=15+17

4x=32

x=8

7. 7(2x-1)-3(4x-1)=5(3x+2)-1

14x-7-12x+3=15x+10-1

2x-4=15x+9

2x-15x=9+4

- 13x=13

x=-1

8.

$2 \frac{2}{3} + 5x = 3x - 1 \frac{2}{6}$

$\frac{2 \times 3 + 2}{3} + 5x = 3x - \frac{1 \times 6 + 2}{6}$

$\frac{8}{3} + 5x = 3x - \frac{8}{6}$

$\frac{16}{6} + \frac{30x}{6} = \frac{18x}{6} - \frac{8}{6}$

16+30x=18x-8

16+8=18x-30x

24=-12x

x=-2

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