求解-9000+(1200/(1+P))+(6000/(1+P)^2)+(6000/(1+P)^3)=0

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求解-9000+(1200/(1+P))+(6000/(1+P)^2)+(6000/(1+P)^3)=0
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求解-9000+(1200/(1+P))+(6000/(1+P)^2)+(6000/(1+P)^3)=0
求解-9000+(1200/(1+P))+(6000/(1+P)^2)+(6000/(1+P)^3)=0

求解-9000+(1200/(1+P))+(6000/(1+P)^2)+(6000/(1+P)^3)=0
设x=1+p,
等式两边同时乘以x^3、除以-600,
解一元三次方程:15x^3-2x^2-10x-10=0
得x≈1.1787,则p≈0.1787