Question

x^2+a/x+1求导等于多少.

Answer 1

y = (x²+a)/(x+1)

= (x²-1+1+a)/(x+1)

= x - 1 + (1+a)/(x+1)

y'= 1 - (1+a)/(x+1)²

或

y'= (x²+2x-a)/(x+1)²