(6000/5x)+2=6000/4x
    x^2 + 5x + 6 = 0
    340（6-t）=5t*t
    1.5=-（x-1）²+4
    （x-1）²-9=0
    18-1.5 x=5.5
    a*（a+1）
    x^2+2/x^2
    X=60765-(497+17.8%)
    X=57784-(497+17.8%)
    X=57784-(524+17.8%)
    X=68962-(524+17.8%)
    X=71419-(524+17.8%)
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*270.9/x*0.35805183739485175）^0.05) =10.27/x
    16.97/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*289.6/x*0.35805183739485175）^0.05)
    11.86/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*281.7/x*0.35805183739485175）^0.05)
    8.81/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*247.2/x*0.35805183739485175）^0.05)
    9.21/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*268.4/x*0.35805183739485175）^0.05)
    9.05/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*251.2/x*0.35805183739485175）^0.05)
    15.6/x = 2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*284.2/x*0.35805183739485175）^0.05)

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