全微分:dz
zxdxzydy duuuuxdxydyz
dz全微分的近似计算:zdzfx(x,y)xfy(x,y)y多元复合函数的求导法:
zf[u(t),v(t)]dzzuzv
dtutvt
zf[u(x,y),v(x,y)]zzuzv
xuxv
x
当uu(x,y),vv(x,y)时,du
uxdxuydy dvvxdxv
y
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