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
    （1-(1+i)^-60）/60
    60i=1-(1+i)^-60
    x*14.3*1000*3.1416*0.4*0.4*(1-sin(2*180*x)/(2*3.1415926*x))+(3*x-1.25)*360*30=0
    x*14.3*1000*3.1416*0.4*0.4*(1-sin(2*180*x)/(2*3.1415926*x))+(3*x-1.25)*360*10=0
    x*14.3*1000*3.1416*0.4*0.4*(1-sin(2*180*x)/(2*3.1415926*x))+(3*x-1.25)*360*9.852=0

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