f(x)=1/x²
那么导数为f'(x)
=lim (dx趋于0) [f(x+dx) -f(x)]/dx
=lim (dx趋于0) [1/(x+dx)² -1/x²]/dx
=lim (dx趋于0) [-(2xdx+dx²)/(x+dx)²x²] /dx
=lim (dx趋于0) -(2x+dx)/(x+dx)²x²
代入dx=0，得到f'(x)= -2/x^3
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f(x)=1/x²
那么导数为f'(x)
=lim (dx趋于0) [f(x+dx) -f(x)]/dx
=lim (dx趋于0) [1/(x+dx)² -1/x²]/dx
=lim (dx趋于0) [-(2xdx+dx²)/(x+dx)²x²] /dx
=lim (dx趋于0) -(2x+dx)/(x+dx)²x²
代入dx=0，得到f'(x)= -2/x^3
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