Question

(х+5)×□=3x+15,(□-у)×8=40-□.​

Answer 1

$1)\; \; (x+5)\cdot \circ =3x+15\\\\(x+5)\cdot 3=3x+15\\\\\\2)\; \; (\circ -y)\cdot 8=40-\circ \\\\(5-y)\cdot 8=40-8y$

Answer 2

1.3

2.5

3.8у

Значения в квадратах

Answer 3

To solve the equations, let's find the values of the unknown variables □, х, and у one by one. We'll start with the first equation:

1. (х + 5) × □ = 3x + 15

To solve for □, we'll isolate it on one side of the equation. First, distribute □ to the terms inside the parentheses:

□ * х + 5 * □ = 3x + 15

Now, move the terms involving □ to the left side and the terms involving x to the right side:

□ * х - 3x = 15 - 5 * □

Factor out □ on the left side:

□ * (х - 5) = 15 - 3x

Finally, divide both sides by (х - 5) to solve for □:

□ = (15 - 3x) / (х - 5)

Now, let's move on to the second equation:

2. (□ - у) × 8 = 40 - □

Again, isolate □ on one side of the equation. First, distribute 8 to the terms inside the parentheses:

8 * □ - 8 * у = 40 - □

Now, move the terms involving □ to the right side and the terms involving у to the left side:

8 * □ + □ = 40 + 8 * у

Factor out □ on the left side:

□ * (8 + 1) = 40 + 8 * у

Simplify:

9 * □ = 40 + 8 * у

Finally, divide both sides by 9 to solve for □:

□ = (40 + 8 * у) / 9

Now, we have expressions for □ in terms of х and у. If you have specific values for х and у, you can substitute them into the equations to find the corresponding values of □.