æ±
å导æ°æ¶ï¼æ¯å°å
¶å®åéçæ常æ°å³å¯ã
å¦xy+z^2y+e^x=0,æ±z对xçå导æ°ã
æ¹ç¨ä¸¤è¾¹åæ¶æ±å¾®åï¼å¾ï¼
ydx+xdy+2zydz+z^2dy+e^xdx=0,
(y+e^x)dx+2zydz+(z^2+x)dy=0,
2zydz=-(y+e^x)dx-(z^2+x)dy.
æ以z对xçå导æ°ä¸ºï¼dz/dx=-(y+e^x)/2zy.