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    (x-1600-900)/10000=(x-1600)/12000
    x乘x乘x乘x乘x乘x乘x乘x等于256
    3200/x=2×x+40/2600
    (x-1600-900)/10000=(x-1600)/12000
    (x-1600-900)/10000=(x-1600)/12000
    (x-1600-900)/10000=(x-1600)/12000
    (x-1600)/12000
    (x-1600-900)/10000
    (x-1600-900)/10000
    9(1-0.0452)(x-55.3)/(2x+55.3)+0.0452((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0447)(x-55.3)/(2x+55.3)+0.0447((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0440)(x-55.3)/(2x+55.3)+0.0440((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0432)(x-55.3)/(2x+55.3)+0.0432((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0420)(x-55.3)/(2x+55.3)+0.0420((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0404)(x-55.3)/(2x+55.3)+0.0404((x-20)/x+4(x-20)/(x+20))=0
    3x=5
    100=6.1/(1+x)+106.1/(1+x)^2
    a×a+a=240
    1800/x-1800/1.5x =20
    0.493/(50/x+6.8)=0.507/(40/x+8.5)

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