Question

Решить уравнение

1. 6 – а = 3∙(3а –8)
2. 0,4∙(6у –7)=0,5∙(3у + 7)
3. 18х –11 = 7
4. 8х – (2х +4) = 2∙(3х – 2)
5. 3∙(5х – 7)= 5∙(3х +4)
6. 20∙(1 – 2х) –15∙(х + 3)= 12∙ (2 – 4х

Answer 1

1.

6-а = 3 За - 8

6-а = 9а - 24

a - 9a = - 24 -6

- 10а = - 30

а =3

2.

0,4 •(6у -7) =0,5 •(Зу +7)

2,4 y - 2,8- 1,5у + 3,5

2,4y - 1,5y = 3,5 + 2,8

0,9y = 6,3

y = 7

3.

18х - 11 = 7

18х - 7+11 =

18 х = 18

х = 1

4.

8x - (2x+4) = 2(3х - 2

8x - 2х - 4 = 6x - 4

8x - 2x = 6x

6x = 6x

5.

3•(5x -7) = 5(3х + 4)

15x - 21 = 15х + 20

21 = 20

6.-------