Вычисли:13м6дм4см+8дм7см=мдмсмочень надо ток фото и на русском ​

1) x = 15

2) x = 7

3) x = 1

4) x = 25

5) x = 9

6) x = 26

7) x = 2

8) x = 1

Объяснение:

1) (23 - х) + 5 = 13

23 - x + 5 = 13

28 - x = 13

- x = 13 - 28

- x = - 15

x = 15

2) (х + 4) + 12 = 23

x + 4 + 12 = 23

x + 16 = 23

x = 23 - 16

x = 7

3)  46 + (3 - x) = 48

46 + 3 - x = 48

49 - x = 48

- x = 48 - 49

- x = - 1

x = 1

4) 20(х - 15) = 200

x - 15 = 10

x = 10 + 15

x = 25

5) 24 - (х + 2) = 13

24 - x - 2 = 13

22 - x = 13

- x = 13 - 22

- x = -9

x = 9

6) 43 - (х - 4) = 21

43 - x + 4 = 21

47 - x = 21

- x = 21 - 47

- x = - 26

x = 26

7) 21 - (5 - х) = 18

21 - 5 + x = 18

16 + x = 18

x = 18 - 16

x = 2

8) 10(х + 14) = 130​

x + 14 = 13

x = 13 - 14

x = -1

1)0,8х-0,5=0,1х-4

0,8х-0,1х=0,5-4

0,7х=-3,5

х=-3.5:0.7

х=5

2)28t+96=4t-12

28t-4t=-12-96

24t=-108

t=-4,5

3)30p-500=600-70p

30p+70p=600+500

100p=1100

p=11

4)0,831x-7,1=0,111x+0,1

0,831x-0,111x=0,1+7,1

0,72x=7,2

x=7,2:0,72

x=10

5)0,6(x-3)-3=1,5(x+3)-1,2

0,6x-1,8-3=1,5x+4,5-1,2

0,6x-1,5x=4,5-1,2+1,8+3

-0,9x=8,1

x=-9

6)(1,75x-2,25)-(2,75-0,25x)=3

1,75x-2,25-2,75+0,25x=3

1,75x+0,25x=3+2,25+2,75

2x=8

x=4

7)вы пропустили в условии

8)-3(3y+4)+4(2y-1)=0

-9y-12+8y-4=0

-9y+8y=4+12

-y=16

9)0,3(5x-7)=3(0,2x+3,2)

1,5x-2,1=0,6x+9,6

1,5x-0,6x=9,6+2,1

0,9x=11,7

x=13

10)4(1,2b+3,7)-2,8=5,2b

4,8b+14,8-2,8=5,2b

4,8b+12=5,2b

4,8b-5,2b=-12

-0,4b=-12

b=30