Question

0,6(4х - 18) - 0,4(5 - 7х) при х = 2,5​

Answer 1

0,6(4x - 18) - 0,4(5 - 7x)

2,4x - 10,8 - 2 + 2,8x

2,4x + 2,8x - 10,8 - 2

5,2x - 12,8

x=2,5

5,2×2,5 -12,8

13 - 12,8=0,2

Ответ: 0,2

Answer 2

To evaluate the expression 0.6(4x - 18) - 0.4(5 - 7x) when x = 2.5, we substitute the value of x into the expression and perform the calculations.

Let's substitute x = 2.5 into the expression:

0.6(4 * 2.5 - 18) - 0.4(5 - 7 * 2.5)

Now we simplify each part of the expression:

0.6(10 - 18) - 0.4(5 - 17.5)

0.6(-8) - 0.4(-12.5)

-4.8 + 5

0.2

Therefore, when x = 2.5, the expression 0.6(4x - 18) - 0.4(5 - 7x) evaluates to 0.2.