Question

求导y=(e^x/x^2)+ln3

Answer 1

注:

(1)

[f(x)/g(x)]'

=[f'(x)g(x)+f(x)g'(x)]/g^2(x)

(2)

常数求导是0

y=(e^x/x^2)+ln3

y'=[e^x*x^2+e^x*(x^2)']/x^4+0

=e^x(2x+x^2)/x^4

=(2+x)e^x/x^3