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已知多组数据X,Y,如何用方程y=a+bx^2+cx^(-2)拟合得到a,b,c的值?x=[27.27032.52932.69934.49537.97538.31743.21946.551]y=[3.07413.08673.08703.10613.14323.14493.20983.2627]x实为一组频率值,数量级为10的14次方.y为

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f(a,b,c)=Sum_{i=1->N}{y(i)-a-b[x(i)]^2 - c[x(i)]^(-2)}^20=df(a,b,c)/da = 2Sum_{i=1->N}{y(i)-a-b[x(i)]^2 - c[x(i)]^(-2)}(-1) ...(1)0=df(a,b,c)/db = 2Sum_{i=1->N}{y(i)-a-b[x(i)]^2 - c[x(i)]^(-2)}{-[x(i)...