对æ¹ç¨æ±å
¨å¯¼æ°å¾å°ï¼
dx+dy+dz-2*(1/2)(yzdx+xzdy+xydz)/âxyz=0
âxyzdx+âxyzdy+âxyzdz-yzdx-xzdy-xydz=0
(âxyz-xy)dz=(yz-âxyz)dx+(xz-âxyz)dy
æ以dz=[(yz-âxyz)/(âxyz-xy)]dx+[(xz-âxyz)/(âxyz-xy)]dy
åï¼
z对xçå导æ°ä¸ºï¼(yz-âxyz)/(âxyz-xy)
z对yçå导æ°ä¸ºï¼(xz-âxyz)/(âxyz-xy)
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