Question

(a+213)-74=305 (400-x)-123=89 Реши с проверкой

Answer 1

Ответ:

(a+213)-74=305

a+213=305+74

a+213=379

a=379-213

a=166

2)(400-x)-123=89

400-x=89+123

400-x=212

x=400-212

x=188

Answer 2

Ответ:

Пошаговое объяснение:

(а+213)=305+74

а=379-213=166

проверка:

166+213-74=305

305=305

(400-х)-123=89

400-х=89+123

400-89-123=х

х=188

проверка:

400-188-123=89

89=89

Answer 3

To solve the given equation, let's break it down step by step:

Equation 1: (a + 213) - 74 = 305 Equation 2: (400 - x) - 123 = 89

Solving Equation 1:

To solve Equation 1, we will first simplify the left side of the equation by combining like terms:

(a + 213) - 74 = 305 a + 213 - 74 = 305 a + 139 = 305

Next, we will isolate the variable 'a' by subtracting 139 from both sides of the equation:

a + 139 - 139 = 305 - 139 a = 166

Therefore, the solution to Equation 1 is a = 166.

Solving Equation 2:

To solve Equation 2, we will follow a similar process:

(400 - x) - 123 = 89

First, simplify the left side of the equation:

400 - x - 123 = 89 277 - x = 89

Next, isolate the variable 'x' by subtracting 277 from both sides of the equation:

277 - x - 277 = 89 - 277 -x = -188

To solve for 'x', we need to multiply both sides of the equation by -1 to get rid of the negative sign:

(-1)(-x) = (-1)(-188) x = 188

Therefore, the solution to Equation 2 is x = 188.

Checking the Solutions:

To check if the solutions are correct, we substitute the values of 'a' and 'x' back into the original equations and see if both sides of the equation are equal.

For Equation 1: (a + 213) - 74 = 305 (166 + 213) - 74 = 305 379 - 74 = 305 305 = 305

The left side of the equation equals the right side, so the solution for 'a' is correct.

For Equation 2: (400 - x) - 123 = 89 (400 - 188) - 123 = 89 212 - 123 = 89 89 = 89

Again, the left side of the equation equals the right side, so the solution for 'x' is correct.

Therefore, the solutions for the given equations are a = 166 and x = 188.