求大神指教
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f^2=x+√(x+√x)
f^2-x=√(x+√x)
f^4-2xf^2+x^2=x+√x
两边对x求导
4f^3*f'-2f^2-4xf*f'+2x=1+1/2√x
(4f^3-4xf)f'=2f^2-2x+1+1/2√x
f'=(2f^2-2x+1+1/2√x)/(4f^3-4xf)
=(2x+2√(x+√x)-2x+1+1/2√x)/4√[x+√(x+√x)](x+√(x+√x)-x)
=(2√(x+√x)+1+1/2√x)/4√[x+√(x+√x)]√(x+√x)
f^2-x=√(x+√x)
f^4-2xf^2+x^2=x+√x
两边对x求导
4f^3*f'-2f^2-4xf*f'+2x=1+1/2√x
(4f^3-4xf)f'=2f^2-2x+1+1/2√x
f'=(2f^2-2x+1+1/2√x)/(4f^3-4xf)
=(2x+2√(x+√x)-2x+1+1/2√x)/4√[x+√(x+√x)](x+√(x+√x)-x)
=(2√(x+√x)+1+1/2√x)/4√[x+√(x+√x)]√(x+√x)
追问
求导为什么要乘以f'(x)
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