Question

×+7×4=40 решение с проверкой​

Answer 1

х + 7 * 4 = 40

х + 28 = 40

х = 40 - 28

х = 12

Проверка:

12 + 7 * 4 = 40

12 + 28 = 40

40 = 40

Answer 2

$x + 7 \times 4 = 40 \\ x + 28 = 40 \\ x = 40 - 28 \\ x = 12$

Проверка:

$12 + 7 \times 4 = 40 \\ 12 + 28 = 40 \\ 40 = 40$

Answer 3

To solve the equation × + 7 × 4 = 40, we can use the order of operations, which states that we should perform the multiplication first, followed by addition or subtraction.

First, let's simplify the multiplication: 7 × 4 = 28.

Now we have the equation × + 28 = 40. To isolate the variable (×), we need to subtract 28 from both sides of the equation:

× + 28 - 28 = 40 - 28

This simplifies to: × = 12.

To verify the solution, we substitute × with 12 in the original equation:

12 + 7 × 4 = 40

12 + 28 = 40

40 = 40

Since both sides are equal, the solution × = 12 is correct.