Question

НОМЕР 4: 8+3x=0 НОМЕР 5: 9x-6=15+12x НОМЕР 6: 7-(x+2)=9 НОМЕР 8: При каком значении у переменной y значения выражений y-2/4 и y/5 [<///>> ЭТО ЧЁРТОЧКА ДЕЛЕНИЯ] Номер 9: Решите уравнение 0.2x(5x-15)+6=1.3x-12

Answer 1

8+3x=o
3x=0-8
3x=-9
X=-9:3
X=-3

9x-6=15+12x
9x-12x=15+6
-3x=21
X=21:(-3)
X=-7

7-(x+2)=9
7-x-2=9
5-x=9
-x=9-5
-x=4
X=-4

Остальное решить не могу(

Answer 2

Номер 4: 8 + 3x = 0

To solve this equation, we need to isolate the variable x.

Let's start by subtracting 8 from both sides of the equation:

8 + 3x - 8 = 0 - 8

This simplifies to:

3x = -8

Next, we divide both sides of the equation by 3 to solve for x:

(3x) / 3 = -8 / 3

The equation becomes:

x = -8 / 3

Therefore, the solution to the equation 8 + 3x = 0 is x = -8 / 3.

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Номер 5: 9x - 6 = 15 + 12x

To solve this equation, we need to isolate the variable x.

Let's start by subtracting 9x from both sides of the equation and subtracting 15 from both sides:

9x - 9x - 6 - 15 = 15 + 12x - 9x

Simplifying this gives us:

-21 = 3x

Next, divide both sides of the equation by 3 to solve for x:

(-21) / 3 = (3x) / 3

This simplifies to:

-7 = x

Therefore, the solution to the equation 9x - 6 = 15 + 12x is x = -7.

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Номер 6: 7 - (x + 2) = 9

To solve this equation, we need to simplify and isolate the variable x.

Let's start by removing the parentheses by distributing the negative sign:

7 - x - 2 = 9

Simplifying this gives us:

5 - x = 9

Next, subtract 5 from both sides of the equation:

5 - x - 5 = 9 - 5

Simplifying further gives us:

-x = 4

To isolate x, multiply both sides of the equation by -1:

(-1)(-x) = 4(-1)

This simplifies to:

x = -4

Therefore, the solution to the equation 7 - (x + 2) = 9 is x = -4.

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Номер 8: При каком значении у переменной y значения выражений y - 2/4 и y/5

To find the values of the expressions y - 2/4 and y/5, we need to substitute different values for y and evaluate the expressions.

Let's start with the expression y - 2/4:

For y = 0:

0 - 2/4 = 0 - 0.5 = -0.5

For y = 1:

1 - 2/4 = 1 - 0.5 = 0.5

For y = 2:

2 - 2/4 = 2 - 0.5 = 1.5

Similarly, let's evaluate the expression y/5:

For y = 0:

0/5 = 0

For y = 1:

1/5 = 0.2

For y = 2:

2/5 = 0.4

Therefore, the values of the expressions y - 2/4 and y/5 vary depending on the value of y.

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Номер 9: Решите уравнение 0.2x(5x - 15) + 6 = 1.3x - 12

To solve this equation, we'll first simplify it, then isolate the variable x.

Let's start by distributing the 0.2x:

0.2x * 5x - 0.2x * 15 + 6 = 1.3x - 12

This simplifies to:

x^2 - 3x + 6 = 1.3x - 12

Next, let's combine like terms by subtracting 1.3x from both sides and adding 12 to both sides:

x^2 - 3x - 1.3x + 6 + 12 = 1.3x - 1.3x - 12 + 12

This simplifies to:

x^2 - 4.3x + 18 = 0

Now, let's solve this quadratic equation. We can either factor it or use the quadratic formula. In this case, factoring might not be straightforward, so let's use the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / (2a)

For our equation x^2 - 4.3x + 18 = 0, the values of a, b, and c are:

a = 1 b = -4.3 c = 18

Substituting these values into the quadratic formula, we have:

x = (-(-4.3) ± √((-4.3)^2 - 4 * 1 * 18)) / (2 * 1)

Simplifying further:

x = (4.3 ± √(18.49 - 72)) / 2

x = (4.3 ± √(-53.51)) / 2

Since the square root of a negative number is not a real number, this equation does not have real solutions. Therefore, there are no real values of x that satisfy the equation 0.2x(5x - 15) + 6 = 1.3x - 12.