Question

Выполните действия:
3/a+ (a-3)/(a+5)
(2x^2)/(x^2-4)-2x/(x+2)
7a/(a-b)-7
 

Answer 1

1)  3/a + (a-3)/(a + 5) = (3*(a  + 5) + a(a - 3)) /a (a + 5) = (3a + 15 +a^2 - 3a)/a(a + 5) =
     =(a^2 + 15)/a(a + 5)
2)  (2x^2)/(x^2 - 4) - 2x/(x + 2) = (2x^2 - 2x(x - 2))/(x^2 - 4) =
     = (2x^2 - 2x^2 + 4x)/(x^ - 4) = 4x/(x^2 - 4)
3)  7a/(a - b) - 7 = (7a - 7(a - b))/(a - b) = (7a - 7a + 7b)/(a - b) = 7b/(a - b)