62.43=1.410+(105.99*X^(-0.5165))/(651.2^(-0.5165)+X^(-0.5165))
    62.43=1.410+(105.99*X^(-0.5165))/(0.586+X^(-0.5165))
    62.43=1.410+105.99*X^(-0.5165)/(0.586+X^(-0.5165))
    62.43=1.410+105.99*X^-0.5165/(0.699+X^-0.5165)
    4x-21=7
    （x/4+x/3.2）-（x/5+x/4）=0.9
    （x/5+x/4）-（x/4+x/3.2）=0.9
    8 = 0.4843*x^4 + 2.2052*x^3 + 4.4296*x^2 + 4.7613*x - 0.8975
    2 = 0.4843*x^4 + 2.2052*x^3 + 4.4296*x^2 + 4.7613*x - 0.8975
    9*x-0.9=7.2*x
    36.5x^2＋93.75x－931＝0
    ［（x+1）×lnx］÷（x-1）
    （x+1）*lnx
    - x^7 + 2*x^6 + 6*x^5 - 11*x^4 - 9*x^3 + 15*x^2 + 4*x - 5=0
    38.44+116.76+275.02=33.22+61.79+181.83+x(74.34+13.07x)
    a×0.6=16.9
    (x-14.04)/x=98%
    (x-4.47)/x=90%
    (x-14.46)/x=70%
    a×0.6=27.9

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