f(x)=√x² +9,f'(x)=? f(x)=[(x²+9)]的負1/2次方微分. =1/2(x²+9)的負1/2次方*(x²+9)的微分. =1/2(x²+9)的負1/2*2X. =2X/2√x²+9. =X/√x²+9.
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