x^4-11x^3+x^2+x+1=0
    x^4-x^3+x^2+x+1=0
    x^4+x^3+x^2-x+1=0
    x^4+x^3+x^2+x+1=0
    x^3+x^2-11x+1=0
    x^2-11x+1=0
    x^2+2x+1=0
    56/n*7=49
    56/x*7
    sqrt((3-x)/(1+x))=(3-x^2)/(1+x^2)
    6x=3
    (48+x)X40%=18+x
    (48+x)X40%=18+x
    20-5sqrt(25-(a-5)^2)=5a/2-a^2
    20-5sqrt(25-(a-5)^2)=5a/2-a^2
    x^2 = -1
    ((3000x×(1+x)^96)/((1+x)^96-1))=36
    ((3000x×(1+x)^96)/((1+x)^96-1))=36
    x-416.06-（x-416.06-5000）*3%=8500
    x-416.06-（x-416.06-5000）*3%=5500

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