Question

Найдите значение выражения:

1) 6/(5x-20) - (X-5)/(X^2-8X+16), Если X = 5

Answer 1

Ответ:

6/(5x-20) - (X-5)/(X^2-8X+16)=6/(5x-4)-(x-5)/(x-4)²=(6x-24-5x+25)/(5(x-4)²)=(x+1)/(5(x-4)²)

(5+1)/(5(5-4)²)=6/5