y=x/(x^2+3)求导

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y=x/(x^2+3)求导

y=x/(x²+3)
y'=1/(x²+3)²·[(x²+3)-x(2x)]
=1/(x²+3)²·(x²+3-2x²)
=(3-x²)/(x²+3)²
用商法则:(u/v)'=(vu'-uv')/v²

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