2x+4×（19-x）=44
     1.333*10^-8 = X^2+0.0137X
     1.333*10^-8 = a^2+0.0137a
    1.333*10^-8=X^2+0.0137X
    lnx＝x
    k^2-2k-17=0
    k^2-2k-17=0
    25=10^x
    2^x=1/2
    2^x=0.5
    1-e^2x
    （x-4）÷x=√3÷3
    0.75x=28-x
    (0.767112V-0.021918V)+327.76=V
    (0.000044V-0.000001V)+327.76=V
    327.76+((V×(1+1%)^5/(1+6.5)^5)-(V×(1+1%)^5/(1+5%)×3%/(1+6.5)^5))=V
    V=327.76+0.904918V
    30%=(y×12.5×1.6667×0.4)/(1-y×12.5×1.6667×0.4)
    30%=(y×12.5×1.6667×0.4)(1-y×12.5×1.6667×0.4)
    30%=(y×12.5×1.6667×0.4)(1-y×12.5×1.6667×0.4)

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