2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*298.6/x*0.35805183739485175）^0.05) =15.97/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*243.8/x*0.35805183739485175）^0.05) = 8.52/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*244.9/x*0.35805183739485175）^0.05) = 7.76/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*272.6/x*0.35805183739485175）^0.05) = 9.58/x
    -0.0262*x^5+0.5272*x^4-4.1192*x^3+15.618*x^2-28.837*x+21.304=0.4166
    x×0.5=1318
    x×0.5=958
    x×0.4=958
    x/40=7
    340(0.008x^3+0.24x^2+x)-(340x+1)(0.024x^2+0.48x+1)=0
    x/40-7=0
    X/40+7=X/25+2
    3270=V+0.0305V+882.3+26.47+130.8+0.0319V+15.99+172.98+124.75
    （X-120.780）*10-0.6-0.6=2
    4496.35=1040000*x*((1+x)^360/((1+x)^360-1))
    4496.35/1040000*x*((1+x)^360/((1+x)^360-1))
    0.5567/(5.5286-x)+0.8274/(2.1281-x)+0.2953/(1-x)+0.1284/(0.7968-x)+0.0212/(0.4064-x)=0.6
    11X=（X+1）*10
    5.5X=（X+1）*5
    (1+0.18)/(1+x)=1+0.05

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