Решите уравнения 7х-2=4 12-2х=3х 5х-8=9+3х 9х+(6-2х)=15 2х-(5х+4) = -8 5-3(2х-7)= - 6х...

Question

Решите уравнения 7х-2=4 12-2х=3х 5х-8=9+3х 9х+(6-2х)=15 2х-(5х+4) = -8 5-3(2х-7)= - 6х 4(5х+8)-2х=12

Answer 1

1)7х-2=4

7х=6

х=6/7

2)12-2х=3х

5х=12

х=12/5=2 2/5=2,4

3)5х-8=9+3х

2х=17

х=17/2= 8 1/2=8,5

4)9х+(6-2х)=15

7х=9

х=9/7=1 2/7

5)2х-(5х+4)=-8

-3х=-4

х=4/3=1 1/3

6)5-3(2х-7)=-6х

5-6х+21=-6х решений нет

7)4(5х+8)-2х=12

20х+32-2х=12

18х=-20

х=-20/18=-1 1/9

Answer 2

7х-2=4

7х=4+2

7х=6

х=0,85

12-2х=3х

-2х-3х=-12

-5х=-12

х=2,4

5х-8=9+3х

5х-3х=9+8

2х=17

х=8,5

9х+(6-2х)=15

9х+6-2х=15

9х-2х=15-6

7х=9

х=1,28

2х-(5х+4)=-8

2х-5х-4=-8

2х-5х=-8+4

-3х=-4

х=1,33

5-3(2х-7)=-6х

5-6х-21=-6х

-6х+6х=-5+21

х=16