Question

2) 7х+3=30-2х 4) 0,2х+2,7=1,4-1,1х 6) 3/8 +15=1/6 +10

Answer 1

Ответ:

2)7х+2х=-3+30

9х=-27:9

9х=3

Answer 2

4)0,2х+1,1х=1,4-2,7
1,3х= -4.1
Х= -4.1 : 1.3
Х=-3.1

Answer 3

Let's solve each equation step by step:

2. 7x + 3 = 30 - 2x

To solve for x, we need to isolate the variable on one side of the equation. We can do this by adding 2x to both sides and subtracting 3 from both sides:

7x + 2x + 3 = 30 - 2x + 2x 9x + 3 = 30

Next, we can subtract 3 from both sides:

9x + 3 - 3 = 30 - 3 9x = 27

To isolate x, we divide both sides by 9:

(9x)/9 = 27/9 x = 3

So the solution to the equation is x = 3.

4. 0.2x + 2.7 = 1.4 - 1.1x

To solve for x, we can start by adding 1.1x to both sides and subtracting 2.7 from both sides:

0.2x + 1.1x + 2.7 = 1.4 - 1.1x + 1.1x 1.3x + 2.7 = 1.4

Next, we can subtract 2.7 from both sides:

1.3x + 2.7 - 2.7 = 1.4 - 2.7 1.3x = -1.3

To isolate x, we divide both sides by 1.3:

(1.3x)/1.3 = -1.3/1.3 x = -1

So the solution to the equation is x = -1.

6. 3/8 + 15 = 1/6 + 10

To solve for x, we can start by finding a common denominator for the fractions. In this case, the common denominator is 24:

(3/8) * (3/3) + 15 = (1/6) * (4/4) + 10 9/24 + 15 = 4/24 + 10

Now, we can add the fractions:

9/24 + 15 = 4/24 + 10 (9 + 15)/24 = 4/24 + 10 24/24 = 4/24 + 10

Simplifying further:

1 = 4/24 + 10 1 = 1/6 + 10 1 = 1/6 + 60/6 1 = 61/6

Therefore, the equation does not have a solution.