(0.0004191-x)*(0.00008087-1.75*x)^1.75=(0.0001574-x)*(0.00009262-1.75*x)^1.75
    4096000000000000/（409600000000000+a^2+1280000）=20a/（640000+a）+0.625
    4096000000000000/（409600000000000+x^2+1280000）=20x/（640000+x）+0.625
    4x²+x+1
    x^3-61x^2+511x-9=0
    x＾3－12×x＾2＋17×x－6＝0
    0.5x²＋69x-32384.87=0
    -0.5x²+69x-32384.87=0
    250X²+53X-53=0
    X÷200=X÷300
    x＾3－3×x＾2－6×x＋8＝0
    30－7y＝89
    12+5X=27
    3X+5X=32
    logX=0.6
    -2x+3=-5
    （800/x）^0.25*1.75*1.89*4800x=10000000*(600/x+1)
    x/(1+x)²
    145000/（11%-R）=1900000
    145000/（11%-R%）=1900000

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