5.32x^2-64.45x-171.23=0
    -5.58x^2+129.79x-142.53=0
    x/(1+x)=0.99
    12586.15=63*32+（220*63-x）*0.95
    12586.15=63*32+（220*63-x）*0.95
    tanx=2x
    x^4-(6+5)*x^3+(7*6-1)*x^2-(13*6-21)*x+3*6=0
    2*3*4*(n-2)-2*3*(n+5)=0
    3*4*(n-2)^2-2*3*(n+5)*(n-2)+2*(7*n-1)=0
    4*(n-2)^3-3*(n+5)*(n-2)^2+2*(7*n-1)*(n-2)-(13*n-21)=0
    (n-2)^4-(n+5)*(n-2)^3+(7*n-1)*(n-2)^2-(13*n-21)*(n-2)+3*n=0
    (n)^4-(n+5)*(n)^3+(7*n-1)*(n)^2-(13*n-21)*(n)+3*n=0
    x^4-(5+5)*x^3+(7*5-1)*x^2-(13*5-21)*x+3*5=0
    x^5-(8+6)*x^4+(7*8+9)*x^3-(16*8-2)*x^2+(13*8-6)*x-3*8=0
    x^5-(7+6)*x^4+(7*7+9)*x^3-(16*7-2)*x^2+(13*7-6)*x-3*7=0
    x^5-(5+6)*x^4+(7*5+9)*x^3-(16*5-2)*x^2+(13*5-6)*x-3*5=0
    2*3*4*5*(n-2)-2*3*4*(n+6)=0
    3*4*5*(n-2)^2-2*3*4*(n+6)*(n-2)+2*3*(7*n+9)=0
    4*5*(n-2)^3-3*4*(n+6)*(n-2)^2+2*3*(7*n+9)*(n-2)-2*(16*n-2)=0
    5*(n-2)^4-4*(n+6)*(n-2)^3+3*(7*n+9)*(n-2)^2-2*(16*n-2)*(n-2)+(13*n-6)=0

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