Question

решите хотя бы 8;9;10;11. пожалуйста!​

Answer 1

Ответ:

1)10х+9=7х

10х-7х=-9

3х=-9

х=-3

2)6х+13=х

6х-х=-13

5х=-13

х=-13/5

3)-8х+10=0

-8х=-10

х=5/4

4)-х-7=х

-х-х=7

-2х=7

х=-7/2

5)-3х-9=2х

-3х-2х=9

-5х=9

х=-9/5

6)-2х-4=3х

-2х-3х=4

-5х=4

х=-4/5

7)х+3=-9х

х+9х=-3

10х=-3

х=-3/10

8)2-3(2х+2)=5-4х

2-6х-6=5-4х

-4-6х=5-4х

-6х+4х=5+4

-2х=9

х=-9/2

9)5-2х=11-7(х+2)

5-2х=11-7х-14

5-2х=-3-7х

-2х+7х=-3-5

5х=-8

х=-8/5

10)3х+5(х+5)=(1-х)+4

3х+5х+25=1-х+4

8х+25=5-х

8х+х=5-25

9х=-20

х=-20/9

11)-х-2+3(х-3)=3(4-х)-3

-х-2+3х-9=12-3х-3

2х-11=9-3х

2х+3х=9+11

5х=20

х=4

12)10(х-9)=7

10х-90=7

10х=7+90

10х=97

х=97/10