来自史峰的问题
隐函数求导求由方程组所确定的函数的导数x+y+z=1x^2+y^2+z^2=1求dy/dxdz/dx3q
隐函数求导求由方程组所确定的函数的导数x+y+z=1x^2+y^2+z^2=1求dy/dxdz/dx3q
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2020-08-10 22:12
隐函数求导求由方程组所确定的函数的导数x+y+z=1x^2+y^2+z^2=1求dy/dxdz/dx3q
隐函数求导求由方程组所确定的函数的导数x+y+z=1x^2+y^2+z^2=1求dy/dxdz/dx3q
都对x求导1+dy/dx+dz/dx=0(1)2x+2ydy/dx+2zdz/dx=0(式子两边约去2)x+ydy/dx+zdz/dx=0(2)上面两式联立解方程组(1)乘以yy+ydy/dx+ydz/dx=0(3)(3)-(2)(y-x)+(y-z)dz/dx=0(y-z)dz/dx=x-ydz/dx=(x-y)/(y...