Question

8/x-9/2x упростите и найдите значение при x=1.4

Answer 1

Ответ:2,5

Пошаговое объяснение:Домножаем первую дробь на 2, получаем (16-9)/2х= 7/2х= 7/2,8=2,5

Answer 2

To simplify the expression, we need to find a common denominator for the two fractions. The common denominator is 2x, so we'll rewrite the fractions with that denominator:

8/x - 9/2x

The first fraction's denominator is x, so we multiply both the numerator and denominator by 2 to make the denominator 2x:

(8 * 2)/(x * 2) - 9/2x

Now the expression becomes:

16/2x - 9/2x

Since both fractions now have the same denominator (2x), we can combine them:

(16 - 9)/(2x)

Now simplify the numerator:

7/(2x)

Now we have the simplified expression: 7/(2x)

To find the value of the expression when x = 1.4, simply substitute the value of x into the expression:

7/(2 * 1.4)

Now, calculate the result:

7/2.8 = 2.5

So, the value of the expression when x = 1.4 is 2.5.