Question

17) (29,42 - x): 2,3 = 9,6; 18) 6x-2x+2,65 = 17,53; 19) (8,2-x):0,9 = 7; 20) 3,1+4,6x + 2,7 = 19,6;​

Answer 1

Ответ:

Пошаговое объяснение:

17) (29,42 - x): 2,3 = 9,6;

29,42 - x = 9,6 * 2,3

29,42 - x = 22,08

x = 29,42 - 22,08

x = 7,34

18) 6x-2x+2,65 = 17,53;

4x + 2,65 = 17,53

4x = 17,53 - 2,65

4x = 14,88

x = 14,88 : 4

x = 3,72

19) (8,2-x):0,9 = 7;

8,2 - x = 7 * 0,9

8,2 - x = 6,3

x = 8,2 - 6,3

x = 1,9

20) 3,1+4,6x + 2,7 = 19,6;​

5,8 + 4,6x = 19,6

4,6x = 19,6 - 5,8

4,6x = 13,8

x = 13,8 : 4,6

x = 3

Answer 2

Let's solve each of these equations step by step:

17. (29 - x) / 2.3 = 9.6

To solve for x, you can multiply both sides of the equation by 2.3 to isolate (29 - x) on the left side:

(29 - x) = 9.6 * 2.3 (29 - x) = 22.08

Now, subtract 29 from both sides to isolate -x:

-x = 22.08 - 29 -x = -6.92

To solve for x, multiply both sides by -1:

x = 6.92

So, the solution to equation 17 is x = 6.92.

18. 6x - 2x + 2.65 = 17.53

First, combine like terms on the left side of the equation:

(6x - 2x) + 2.65 = 17.53 4x + 2.65 = 17.53

Now, subtract 2.65 from both sides:

4x = 17.53 - 2.65 4x = 14.88

Finally, divide both sides by 4 to isolate x:

x = 14.88 / 4 x = 3.72

So, the solution to equation 18 is x = 3.72.

19. (8.2 - x) / 0.9 = 7

To solve for x, multiply both sides of the equation by 0.9 to isolate (8.2 - x) on the left side:

(8.2 - x) = 7 * 0.9 (8.2 - x) = 6.3

Now, subtract 8.2 from both sides to isolate -x:

-x = 6.3 - 8.2 -x = -1.9

To solve for x, multiply both sides by -1:

x = 1.9

So, the solution to equation 19 is x = 1.9.

20. 3.1 + 4.6x + 2.7 = 19.6

First, combine like terms on the left side of the equation:

(3.1 + 2.7) + 4.6x = 19.6 5.8 + 4.6x = 19.6

Now, subtract 5.8 from both sides:

4.6x = 19.6 - 5.8 4.6x = 13.8

Finally, divide both sides by 4.6 to isolate x:

x = 13.8 / 4.6 x = 3

So, the solution to equation 20 is x = 3.