2x=tanx
    x-54.84-(x*0.173)-7.42-(x*0.36)-18-10=23.68
    10x＾2+0.196x-2000
    sin(x) + (x -acos0 / 2) * cos(x) = 0
    1.25x-40sqrt6*sqrtx+1400=0
    1.5625x^2-6100x+1960000=0
    lnx×lnx×x＝2
    17.21/2*20.5/5(20.5-20.5/5)
    17.21/2*(20.5-2*20.5/5)
    1/10*17.21*20.5^2
    17.21/2*20.5/4(20.5-20.5/4)
    20lg(x/4)=27
    17.21/2*(20.5-2*20.5/4)
    (20000-100x)/√x>1.96
    (20000-1000x)/√x>1.96
    1.25x-40^sqrt6^sqrtx+1400=0
    8.1x^(8)＋54x^(6)+24280x^(4)-40009^(2)+16000＝0
    x^4-2*x^3+2*x^2-2*x+1=0
    x/x+1=0.25
    x^2-4.5x-5.2=0

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