Question

高数考试，求解答

设z=f(xy,y-z),,1+f2`不等于0，求dz

Answer 1

你好！
dz=f1'd(xy)+f2'd(y-z)
dz=f1'(xdy+ydx)+f2'dy-f2'dz
(1+f2')dz=(xf1'+f2')dy+yf1'dx
所以
dz=[(xf1'+f2')dy+yf1'dx]/(1+f2')
还望采纳O(∩_∩)O哈！