Question

Решите уравнение (без проверки) (х+15)-8=17 55-(х-15)=30 (х+27)-12=42 115-(35+y)=39 Помогите пожалуйста))))))

Answer 1

a)(x+27)-12=42

   раскрываем скобки

   х+27-12=42

   х+15=42

   х=42-15

   х=27                     

   (27+27)-12=42       

           54-12=42

                42=42

 

б) 115-(35+y)=39

    раскрываем скобки

    115-35-у=39

    80-у=39

    у=80-39

    у=41                    

    115-(35+41)=39

            115-76=39

                  39=39

Answer 2

Solving the Equations

Let's solve the given equations step by step.

1. Equation 1: - (x + 15) - 8 = 17 - x + 15 - 8 = 17 - x + 7 = 17 - x = 17 - 7 - x = 10 2. Equation 2: - 55 - (x - 15) = 30 - 55 - x + 15 = 30 - 70 - x = 30 - -x = 30 - 70 - -x = -40 - x = 40 3. Equation 3: - (x + 27) - 12 = 42 - x + 27 - 12 = 42 - x + 15 = 42 - x = 42 - 15 - x = 27 4. Equation 4: - 115 - (35 + y) = 39 - 115 - 35 - y = 39 - 80 - y = 39 - -y = 39 - 80 - -y = -41 - y = 41 So, the solutions to the given equations are: - x = 10 - x = 40 - x = 27 - y = 41