第5题，大一高数，求助大佬
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x +y + z = 0
1+ dy/dx + dz/dx= 0 (1)
xyz=2
yz + xz.dy/dx + xy.dz/dx =0 (2)
xy*(1) -(2)
xy + xy.dy/dx -yz - xz.dy/dx =0
(xy-xz).dy/dx = -(xy -yz)
dy/dx =-(xy-yz)/(xy-xz)
xz*(1) -(2)
xz + xz.dz/dx -yz - xy.dz/dx =0
(xz-xy) dz/dx = -(xz-yz)
dz/dx = -(xz-yz)/(xz-xy)
1+ dy/dx + dz/dx= 0 (1)
xyz=2
yz + xz.dy/dx + xy.dz/dx =0 (2)
xy*(1) -(2)
xy + xy.dy/dx -yz - xz.dy/dx =0
(xy-xz).dy/dx = -(xy -yz)
dy/dx =-(xy-yz)/(xy-xz)
xz*(1) -(2)
xz + xz.dz/dx -yz - xy.dz/dx =0
(xz-xy) dz/dx = -(xz-yz)
dz/dx = -(xz-yz)/(xz-xy)
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