函数u^2lnv,u=x/y,v=3x-2y

题目

函数u^2lnv,u=x/y,v=3x-2y

答案

z=u^2lnv,u=x/y,v=3x-2yðz/ðx=(ðz/ðu)*(ðu/ðx)+(ðz/ðv)*(ðv/ðx)=2ulnv*(1/y)+(u^2/v)*3=2(x/y^2)ln(3x-2y)+3x^2/[y^2(3x-2y)]ðz/ðy=(ðz/ðu)...