Question

求函数f(x)=x²/x²+3的极值点和极值

Answer 1

f'(x)=[2x(x^2+3)-x^2(2x)]/(x^2+3)^2

=[2x^3+6x-2x^3]/(x^2+3)^2

=6x/(x^2+3)^2

x>0时f'(x)>0,函数单调增,X