N1  ...

                                                N1   13-5х=8-2х                                                         N2           4у+15=6н+17                                                      N3

          8с+0. 73=4, 61-8с                                                       N4

                  5х+(3х-7)=9                                                              N5

         48=11-(9а+2)                                                N6           13-(5х+11)=6х                                 N7 (7х+11)-(6х+3)=5                                                 N8             2=(3х-5)-(7-4х)  решите пожалуйста я вас очень прошу, отблагадарю!

Ответ:

13-5х=8-2х13-8=-2х+5х

3х=5

х=5/3=1 2/3

4у+15=6у+174у-6у=17-15

-2у=2

у=2/(-2)

у=-1

8с+0.73=4,61-8с8с+8с=4,61-0,73

16с=3,88

с=3,88/16

с=0,24

5х+(3х-7)=9

5х+3х-7=9

8х=9-7

х=2/8

х=0,25                                                            

48=11-(9а+2)11-9а-2=48

-9а=48-9

а=39/(-9)

а=-4 3/9=-4 1/3                                          

13-(5х+11)=6х13-5х-11=6х

-5х-6х=-2

х=-2/(-11)

х=2/11

                            (7х+11)-(6х+3)=5                                              2=(3х-5)-(7-4х)

3х-5-7+4х=2

7х=2+12

х=14/7

х=2

Ответ #2:

1)

13-5х=8-2х

5х-2х=13-8

3х=5

х=5\3

х=1целая2\3

2)

4у+15=6у+17

6у-4у=-15+17

2у=-2

у=-2/2

у=-1

3)

8с+0,73=4,61-8с

8с+8с=4,61-0,73

16с=3,88

с=3,88/16

с=0,24

4)

5х+(3х-7)=9

8х=9-7

8х=2

х=2/8

х=1/4=0,25

5)

48=11-(9а+2)

48=11-9а-2

9а=11-2-48

9а=-39

а=-39/9

а=-13/3

а=4целых3/9=4целых1/3   

6)

13-(5х+11)=6х

13-5х-11=6х

6х+5х=13-11

11х=2

х=2/11

7)

(7х+11)-(6х+3)=5

7х+11-6х-3=5

7х-6х=5+3-11

х=-3

8)

2=(3х-5)-(7-4х)

3х-5-7+4х=2

3х+4х=2+5+7

7х=14

х=14/7

х=2  

Источник: https://znanija.com/task/312283