x^4-5x^3-15x^2+5x+1 = 0
    x^4-10x^3-15x^2+10x+1 = 0
    x^4-10x^3-26x^2+10x+1 = 0
    x^4-10x^3-20x^2+10x+1 = 0
    x^4-10x^3-24x^2+10x+1 = 0
     114514x=x-4
    x*x*x*x*x*x*x*x*x*x*x-2x+1=0
    4x²(117x²-12)=39²
    -2/1x^2+82x-1440
    x^4-4x^3-6x^2+4x+1=0
    x^4+4x^3-6x^2-4x+1=0
    x^4+4x^3-6x^2-4x-1=0
    x^4-4x^3-6x^2-4x-1=0
    x^4-4x^3-6x^2-4x+-1=0
    x^4-4x^3-6x^2-4x+1=0
    x*x-14.4x+9.17=0
    x^3+40x^2+400x+100＝0
    tanx=x^2
    25x^2+5x-12=0
    x^3-3*x^2+18*x-27=0

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