4x^4-7x^2-5x-1
    57x^2-2150x+11400=0
    -0.85^3+6*0.85^2-8*0.85+x=0
    20lg(22/x)=6
    125x²+20x=8
    1÷l331
    1/（97x256）
    100O01
    100O01
    (4d^2+90d+400)(1/(d+199/30))=d^3+30d^2+200d
    (4d^2+90d+400)(1/(d+199/3))=d^3+30d^2+200d
    3d^3+(60+398/15)d^2+797d+(40×199)/3=0
    3d^3+(60+398/15)d^2+200d=0
    3d^3+(60+398d^2/15)+200d=0
    x＾4=3x＾2+9-9x
    (x-2130)/2.9935 = x^(2/3)
    (x-2680)/2.1544=x^(2/3)
    x-2680=2.1544x^2/3
    50.76x²+1.5912x-0.0099=0
    1+5+2+56+5+65+5x=1

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