用秦九韶算法求多项式f(x)=7x^7+6x^6+5x^5+4x^4+3x^3+2x^2+x,当x=3时的值
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x(7x^6+6x^5+5x^4+4x^3+3x^2+2x+1)
=x(x(7x^5+6x^4+5x^3+4x^2+3x+2)+1)
=x(x(x(7x^4+6x^3+5x^2+4x+3)+2)+1)
=x(x(x(x(7x^3+6x^2+5x+4)+3)+2)+1)
=x(x(x(x(x(7x^2+6x)+5)+4)+3)+2)+1)
=x(x(x(x(x(x(7x+6)+5)+4)+3)+2)+1)
=x(x(x(x(x(x(27)+5)+4)+3)+2)+1)
=x(x(x(x(x(86)+4)+3)+2)+1)
=x(x(x(x(262)+3)+2)+1)
=x(x(x(789)+2)+1)
=x(x(2369)+1)
=x(7108)
=21324
=x(x(7x^5+6x^4+5x^3+4x^2+3x+2)+1)
=x(x(x(7x^4+6x^3+5x^2+4x+3)+2)+1)
=x(x(x(x(7x^3+6x^2+5x+4)+3)+2)+1)
=x(x(x(x(x(7x^2+6x)+5)+4)+3)+2)+1)
=x(x(x(x(x(x(7x+6)+5)+4)+3)+2)+1)
=x(x(x(x(x(x(27)+5)+4)+3)+2)+1)
=x(x(x(x(x(86)+4)+3)+2)+1)
=x(x(x(x(262)+3)+2)+1)
=x(x(x(789)+2)+1)
=x(x(2369)+1)
=x(7108)
=21324
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