X(X+1)=6.25
    2x+3=0
    2x+3=0
    3x+1=0
    x-[(x-800)*0.2]=1000
    10*200=X+1150*10
    2.4=(0.01*L^1.85+119.43)^0.5*L^0.78
    3.2=(0.01*L^1.85+19.90)^0.5*L^0.78
    1.6=(0.01*L^1.85+19.90)^0.05*L^0.78
    1.2=(0.01*L^1.85+119.43)^0.5*L^0.78
    1.2=(0.01*L^1.85+119.43)^0.5*L^0.78
    1.6=(0.01*L^1.85+19.90)^0.5*L^0.78
    2.67=(0.01*L^1.85+1.99)^0.5*L^0.78
    7600/(x+23.52)+10000/(x+11.76）+10000/(x+11.76)=150
    s-s/1.03*0.03*1.12=5.51
    S-S/1.03*0.03*1.12=5.51
    x^3-12x^2+48x-64=0
    7600/(x*1.24）+7000/(x*1.12)+10000/(x*1.12)=150
    7600/(x+23.76）+7000/(x+11.88)+10000/(x+11.88)=150
    7600/(x+23.76）+6700/(x+11.88)+10000/(x+11.88)=150

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