Question

-(2x+1)=41 5(12-x)=27 1,2(2x-1)=3,6 реши уравнения

Answer 1

1)

-2x-1=41

-2x=42

x=-21

2)

60-5x=27

60-27=5x

33=5x

x=6,6

3)

2,4x-1,2=3,6

2,4x=4,8

x=2

Answer 2

1. -(2x+1)=41
-2x-1=41
-2x=42
x=42:(-2)
x= -21

2. 5(12-x)=27
60-5x =27
-5x=27-60
-5x= -33
x= 6,6

3. 1,2(2x-1)=3,6
2,4x-1,2=3,6
2,4x=4,8
x=2

Answer 3

Let's solve the given equations step by step:

1. -(2x + 1) = 41

To solve for x, we need to isolate x on one side of the equation. First, get rid of the negative sign by multiplying both sides by -1:

-1 * -(2x + 1) = -1 * 41

This simplifies to:

2x + 1 = -41

Now, isolate x by subtracting 1 from both sides:

2x = -41 - 1 2x = -42

Finally, divide both sides by 2 to solve for x:

x = -42 / 2 x = -21

So, the solution for the first equation is x = -21.

2. 5(12 - x) = 27

First, distribute the 5 on the left side:

5 * 12 - 5x = 27

Now, isolate x by moving the constant term to the other side:

60 - 5x = 27

Next, isolate the variable term by subtracting 60 from both sides:

-5x = 27 - 60 -5x = -33

Finally, divide both sides by -5 to solve for x:

x = -33 / -5 x = 6.6

So, the solution for the second equation is x = 6.6.

3. 1/2(2x - 1) = 3.6

To solve this equation, first, distribute the 1/2 on the left side:

(1/2) * 2x - (1/2) * 1 = 3.6

Simplify:

x - 1/2 = 3.6

Now, isolate x by adding 1/2 to both sides:

x = 3.6 + 1/2

To add the fractions, find a common denominator:

x = (18/5) + (1/2)

To add the fractions, convert 1/2 to have a denominator of 5:

x = (18/5) + (5/5)

x = (18/5) + (5/5)

Now, add the fractions:

x = (18 + 5)/5 x = 23/5

So, the solution for the third equation is x = 23/5 or x = 4.6.

Please double-check my calculations to ensure accuracy, as mistakes can happen during manual calculations.