Question

Номер 990.Решмте уравнение: 1)8,5-(6,5-x)=3,8 2)-2,3x+(2,8+9,3x)=9,8 3)-(9,8-x)-10,5=-20,8 4)-6,7x+(-3,5-3,3x)=6,5

Answer 1

Ответ:

ответ во вложенной картинке

Answer 2

Equation 1: 8.5 - (6.5 - x) = 3.8

To solve this equation, we can follow these steps:

1. Remove the parentheses by distributing the negative sign: 8.5 - 6.5 + x = 3.8

2. Combine like terms: 2 + x = 3.8

3. Solve for x by subtracting 2 from both sides: x = 3.8 - 2

4. Simplify: x = 1.8

Therefore, the solution to Equation 1 is x = 1.8.

Equation 2: -2.3x + (2.8 + 9.3x) = 9.8 + 3 - (9.8 - x) - 10.5 = -20.8

To solve this equation, we can follow these steps:

1. Simplify the equation by combining like terms: -2.3x + 2.8 + 9.3x = 9.8 + 3 - 9.8 + x - 10.5

2. Combine like terms on both sides: 6.7x + 2.8 = 3 + x - 10.5

3. Move all terms with x to one side and all constant terms to the other side: 6.7x - x = 3 - 2.8 - 10.5

4. Simplify: 5.7x = -10.3

5. Solve for x by dividing both sides by 5.7: x = -10.3 / 5.7

6. Simplify: x ≈ -1.807

Therefore, the solution to Equation 2 is x ≈ -1.807.