x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=5000
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=4500
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=4000
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=3500
    x-(x/1.01*0.01)-{（x-(x/1.01*0.01)）*0.8-(x/1.01*0.01*0.07/2)}*0.2-(x/1.01*0.01*0.07/2)=3400
    -0.5x^2 + 0.75x - 800 = 0
    lnx=0.58
    lnx=0.94
    x=0.2*（5.6-8.2x）^2
    x=0.5*（5.6-8.2x）^2
    x=0.5*（6-8.2x）^2
    x=0.5*（140/53-1.2-3.9x）^2
    x=0.5*（70/53+3.8-3.9x）^2
    A+(A*13%)=3199300
    A+(A*13%)=2140100
    A+(A*13%)=3199252
    A+(A*13%)=2140065
    341.96×（（1+0.031）1-1）+（0+10.26+0.01V）×（（1+0.031）0.5-1）
    846×[（1+0.0435）1-1]+（80+27.78+0.01V）×[（1+0.0435）0.5-1]
    104.2*（1+x）^7=107.4

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