Question

2,5x - 2,5y= _ Если x - y=4

Answer 1

Применяем распределительный закон умножения:

a(b-c)=ab-ac

и обратно

ab-aс=a(b-с)

2,5x - 2,5y=2,5 (х-у)=2,5·4=10

Answer 2

To find the value of the expression 2.5x - 2.5y when x - y = 4, we can substitute the value of x - y into the equation.

Given: x - y = 4

Let's solve this equation for x: x = y + 4

Now we can substitute this value of x into the expression 2.5x - 2.5y: 2.5x - 2.5y = 2.5(y + 4) - 2.5y

Expanding the expression: 2.5(y + 4) - 2.5y = 2.5y + 10 - 2.5y

Combining like terms: 2.5y - 2.5y + 10 = 10

Therefore, 2.5x - 2.5y = 10 when x - y = 4.