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求值域,就是求方程的最小值和最大值 首先對方程求一階導數dy/dx=1/(x^2+3*x+6)-(x+2)/(x^2+3*x+6)^2*(2*x+3) 然後令dy/dx=0,求到x=0或-4 代人原方程:y(0)=0.3333,y(-4)=-0.2 那麼方程的最小值為-0.2,最大值為0.3333
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