Question

1)1,2x+7=0,8x+9;2)3x+2(x+5)=9x+43)5x+9=5x=5​

Answer 1

Ответ:

1) 1,2x+7=0,8x+9

Используем свойство уравнения (перестановка слагаемых из одной части в другую)

1,2x-0,8x=9-7

0,4x=2

Получили линейное уравнение, и просто решаем его.

x = 2/0,4

x=5

Ответ: [5]

2) 3x+2(x+5)=9x+4

Упростим уравнение.

3x+2x+10=9x+4

3x+2x-9x=4-10

-4x=-6

x = -6/(-4)

x=1,5

Ответ: [1,5]

3) 5x+9=5x=5

5x+9=5=5x

5x=5-9

5x=-4

x первый = -4/5

x первый= -0,8

5*(-0,8)+9=5=5x

x второй = 5/5

x второй = 1

5*(-0,8)+9=5=5*1

Ответ: [x первый = -0,8; x второй = 1]

Пошаговое объяснение:

Answer 2

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

1. 1,2x + 7 = 0,8x + 9

First, let's simplify the equation by moving all the terms with x to one side of the equation and constants to the other side:

1,2x - 0,8x = 9 - 7

Now, combine like terms on both sides:

0,4x = 2

To solve for x, divide both sides by 0.4:

x = 2 / 0.4

x = 5

So, the solution for this equation is x = 5.

2. 3x + 2(x + 5) = 9x + 4

First, distribute the 2 on the left side of the equation:

3x + 2x + 10 = 9x + 4

Now, let's move the terms with x to one side and constants to the other:

3x + 2x - 9x = 4 - 10

Combine like terms:

-4x = -6

Now, divide both sides by -4 to solve for x:

x = -6 / -4

x = 3/2 or 1.5

So, the solution for this equation is x = 1.5.

3. 5x + 9 = 5x + 5

In this equation, you can see that the variable x appears on both sides of the equation. When you simplify further, you'll notice that the x terms cancel out:

5x - 5x + 9 = 5 - 5

0x + 9 = 0

Now, you have 0x, which is just 0, so the equation simplifies to:

0 + 9 = 0

9 = 0

This equation is not possible because it leads to a contradiction (9 is not equal to 0). Therefore, there is no solution for this equation.