180×0.55+0.6（x-180）+180×0.55+0.6×（400-180）+0.85×(800-x-400)=487
    180×0.55+0.6（x-180）+180×0.55+0.6×（400-180）+0.85×(800-x-400)=487
    -7.205*x^3+37.142*x^2-48.687*x-295.174=0
    7.205*x^3+37.142*x^2-48.687*x-295.174=0
    x*sqrt（x^3）
    xsqrt（x^3）
    0=xx1000-1000x1000+600000
    0=1000x-1000x1000+600000
    0=1000x-1000x+600000
    0=Xx1000-1000xX+600000
    0=2000x-1000x+600000
    1/2x+6=2/3（x+6）
    2.36/(1+R)+(2.9854/R+2.714)/(1+R)^2=30
    x+0.15*x²=2.1571
    x+0.15*x²=2.1571
    10000×p-10000×p=24000000
    10000×p-10000×p=24000000
    （10000×p-10000×p×5%-1000000）÷1000000=20%
    （10000×p-10000×p×5%-1000000）÷1000000=20%
    2x^3-3x^2-1=0

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