-x^2/(90000000000000000*sqrt(1 - x^2/90000000000000000)) + sqrt(1 - x^2/90000000000000000)=0
    2800*[x*(1+x)^30/(1+30)^30-1]=200
    2*c^3-3*c^2-12*c+20=0
    200×T=300×T-600
    7600/(x+101*0.12)+15100/x=150
    7600/(x+105*0.12)+15100/x=150
    7600/(x+101*0.12)+17600/x=150
    3600/(x+101*0.12)+20000/x=150
    7600/(x+101*0.12)+17600/x=150
    7600/(x+101*0.12)+15100/x=150
    7600/(x+101*0.12)+17600/x=150
    7600/(x+101*0.12)+15100/x=150
    -110498295.66+690560658.65+X=8606517.02
    7600/(x+105*0.12)+17500/x=150
    7600/(x+105*0.12)+17500/x=150
    7600/(x+105*0.12)+17600/x=150
    7600/(x+105*0.12)+15100/x=150
    7600/(x+112*0.32)+10000/(x+112*0.2)+10000/x=150
    3600/(x+101*0.12)+20000/x=150
    7600/(x+101*0.12)+15100/x=150

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