偏导数
8*** 2013-06-05 19:16:56 举报
x^2=u^2+v^2+2uv=y+2uv, uv=(x^2-y)/2, z=u^3+v^3=(u+v)(u^2+v^2-uv)=x[y-(x^2-y)/2]=x(3y-x^2)/2=(3xy-x^3)/2. z'=(3/2)(y-x^2).