2.74x^2-36.47x+117.69
    e^x(1-x)
    lgx=-0.577
    lgx=-0.577
    1.21*0.79*x=3.19
    2.74x^2-39.94x+185
    2.74x^2-39.94x+200
    2.74x^2-39.94x+258
    r^3-54r+135=0
    2.74x^2-39.94x+120
    2.74x^2-39x+287.61
    2.74x^2-39.94x+287
    2.74x^2-39.94x+287.61
    2.74x^2-39.94+287.61
    1.21*0.79*1.31*x*1.09=3.19
    (12%-10%)/(12%-X)=(-50-150)/(-50-0)
    2.74x^2-36.47x+120.23
    2.74x^2-36.47x-90.53
    （12%-10%）/（12%-x）=（-50-150）/（-50-0）
    2.74x^2-36.47x+23.66

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