Question

0,3 (1,7x-5,2y)-3,4 (2,5x+2y),якщо x=2,y=-3,5

Answer 1

Ответ:

13.28

Пошаговое объяснение:

0.51x-1.56y-8.5x-6.8y=-7.99x-8.36y

Подставляем значение х=2, у=-3.5

-7.99(2)-8.36(-3.5)=-15.98+29.26=13.28

Answer 2

To evaluate the expression 0.3(1.7x - 5.2y) - 3.4(2.5x + 2y) when x = 2 and y = -3.5, follow these steps:

Step 1: Replace x with 2 and y with -3.5 in the expression. Step 2: Perform the calculations.

Let's start with Step 1:

0.3(1.7x - 5.2y) - 3.4(2.5x + 2y)

Replace x with 2 and y with -3.5:

0.3(1.7 * 2 - 5.2 * (-3.5)) - 3.4(2.5 * 2 + 2 * (-3.5))

Now, calculate the values inside the parentheses:

0.3(1.7 * 2 + 18.2) - 3.4(5 + (-7))

Perform further calculations:

0.3(3.4 + 18.2) - 3.4(-2)

0.3(21.6) + 6.8

6.48 + 6.8

Now, add the final values:

13.28

So, when x = 2 and y = -3.5, the expression 0.3(1.7x - 5.2y) - 3.4(2.5x + 2y) evaluates to 13.28.