一元函数y=f(x,x^2)由二元函数f(u,v)与两个一元函数u=x,v=x^2复合而成,则dy/dx=fu×du/dx+fv×dv/dx,代入dy/dx=4x^3+6x^2+1,fu=2x^2-2x+1,du/dx=1,dv/dx=2x,求得fv=2x^2+2x+1
一元函数y=f(x,x^2)由二元函数f(u,v)与两个一元函数u=x,v=x^2复合而成,则dy/dx=fu×du/dx+fv×dv/dx,代入dy/dx=4x^3+6x^2+1,fu=2x^2-2x+1,du/dx=1,dv/dx=2x,求得fv=2x^2+2x+1