60-16 x+x^2减3/5×16 x^2=0
    13-11x=7699
    x^7-1=0
    x*x*x*x*x*x*x+x*x*x*x*x+x*x*x*x+x*x*x+x*x+x+1=0
    x*x*x*x*x*x*x=1
    x*x*x*x*x=1
    x*x*x=1
    x*x*x
    x*x=1
    ⅓x^3＋x^2＋x＋4
    sin(-πx/2)
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0
    x*x-3x+1=0

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