90.7*1.57*(0.5+40*300/16/(x+300))*300=(9000*9000-(x+600)*(x+600))/1000*35
    1318.8*(0.5+12000/(16*x+16*300))=(9000*9000-(x+300)^2)*35/1000/1000
    0.7*1.57*(0.5+1.2*10^4/16/(x+300))*4*(x+300)*300=(9000*9000-(x+600)^2)/1000/1000*35
    0.7*1.57*(0.5+1.2*10^4/16/(x+300))*16*(x+300)*300=(9000*9000-(x+600)^2)/1000/1000*35
    -y^3+lny+1=0
    300*160=(300-60)*(160+x)
    2x-1=2
    2X×0.8-X＝10000
    (71000+1440*x)/2600*x=1
    X-10%X/4=19300
    X-10%X/4=19300
    (71000+1440*x)/2600*x=1
    X÷0.9+215=X÷0.8+125
    X-10%X/4=19300
    X+1430/945X=66500
    X+1430/945X=66600
    X+1430/945X=66800
    X+1430/945X=66800
    10000/x+17600/(x+50)=150
    （1-(1+i)^-60）/60=i

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