Question

1. 0,2x+2,3 = 0,7x-3,2 2. -40×(-7x+5)=-1600 3. (-20x-50)×2=100

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

Let's solve each equation step by step:

1. 0.2x + 2.3 = 0.7x - 3.2

   First, let's move all terms containing x to one side of the equation and constants to the other side:

   0.2x - 0.7x = -3.2 - 2.3

   Combine like terms:

   -0.5x = -5.5

   Now, divide both sides by -0.5 to solve for x:

   x = -5.5 / (-0.5) x = 11

2. -40×(-7x+5) = -1600

   First, distribute -40 on the left side of the equation:

   280x - 200 = -1600

   Next, move the constant term to the other side:

   280x = -1600 + 200 280x = -1400

   Now, divide both sides by 280 to solve for x:

   x = -1400 / 280 x = -5

3. (-20x - 50)×2 = 100

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

   -40x - 100 = 100

   Next, move the constant term to the other side:

   -40x = 100 + 100 -40x = 200

   Now, divide both sides by -40 to solve for x:

   x = 200 / (-40) x = -5

So, the solutions to the three equations are:

1. x = 11
2. x = -5
3. x = -5

Answer 3

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

1. 0.2x + 2.3 = 0.7x - 3.2

   To solve this equation, you want to isolate the variable x on one side of the equation. Start by moving all the terms with x to one side and constants to the other side:

   Subtract 0.7x from both sides: 0.2x - 0.7x + 2.3 = -3.2

   Combine like terms: -0.5x + 2.3 = -3.2

   Now, subtract 2.3 from both sides to isolate -0.5x: -0.5x = -3.2 - 2.3 -0.5x = -5.5

   Finally, divide both sides by -0.5 to solve for x: x = (-5.5) / (-0.5) x = 11

2. -40(-7x + 5) = -1600

   Start by simplifying the left side of the equation:

   -40 * (-7x + 5) = -1600

   Distribute -40 to both terms inside the parentheses:

   280x - 200 = -1600

   Now, add 200 to both sides to isolate the term with x:

   280x - 200 + 200 = -1600 + 200

   280x = -1400

   Finally, divide both sides by 280 to solve for x:

   x = -1400 / 280

   x = -5

3. (-20x - 50) * 2 = 100

   Start by simplifying the left side of the equation:

   (-20x - 50) * 2 = 100

   Distribute 2 to both terms inside the parentheses:

   -40x - 100 = 100

   Now, add 100 to both sides to isolate the term with x:

   -40x - 100 + 100 = 100 + 100

   -40x = 200

   Finally, divide both sides by -40 to solve for x:

   x = 200 / -40

   x = -5

So, the solutions to the three equations are:

1. x = 11
2. x = -5
3. x = -5