求大神帮我解答这个线性代数题目,谢谢了! 100
2个回答
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f(x)=(x^3 -a )^2
f'(x)=2(x^3 -a )(3x^2)=6x^2(x^3 -a) = 6x^5-6ax^2
g(x)=x-f(x) =x-(x^3 -a )^2 = -x^6+2ax^3+x-a^2
g'(x)=1-f'(x) = 1-6x^2(x^3 -a)=1-6x^5+6ax^2
牛顿迭代格式
X(n+1)=Xn-g(Xn)/g'(Xn)=Xn-[Xn-f(Xn)]/[1-f'(Xn)]
即
X(n+1)=Xn-(-Xn^6+2aXn^3+Xn-a^2)/(1-6Xn^5+6aXn^2)
f'(x)=2(x^3 -a )(3x^2)=6x^2(x^3 -a) = 6x^5-6ax^2
g(x)=x-f(x) =x-(x^3 -a )^2 = -x^6+2ax^3+x-a^2
g'(x)=1-f'(x) = 1-6x^2(x^3 -a)=1-6x^5+6ax^2
牛顿迭代格式
X(n+1)=Xn-g(Xn)/g'(Xn)=Xn-[Xn-f(Xn)]/[1-f'(Xn)]
即
X(n+1)=Xn-(-Xn^6+2aXn^3+Xn-a^2)/(1-6Xn^5+6aXn^2)
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