x^4-10x^3+25x^2-10x-1=0
    x^4-10x^3-25x^2-10x-1=0
    x^4+10x^3+25x^2+10x+1=0
    x^4+10x^3+25x^2+10x-1=0
    x^4-10x^3+25x^2+10x-1=0
    x^4-10x^3+25x^2+10x+1=0
    x^4-10x^3-25x^2-10x+1=0
    x^4-10x^3+25x^2-10x+1=0
    x^4-10x^3+35x^2-50x+24=0
    x^4-2x^2+1=0
    x^4-2x^2-1=0
    x^4-4x^2-1=0
    x^4-4x^2-4=0
    x^4-4x-4=0
    x^4-4x+4=0
    x^4-4x+1=0
    x^4-3x+1=0
    x^3-3x+1=0
    0.4a+8=0.36*（a+30）
    0.4a+8=0.36*（a+22）

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