x^2-17.7x+78.2=0
    {a^2/(a+1)-a+1}/(a^2-1)/(a^2+2a+1)
    x^2-5.8x+5.5=0
    x^2-14.8x-53.3=0
    2.65x^2-33.32x+8.5859=0
    2.65x^2-286.136x-2.88235=0
    84.1 = 35.919ln(x) - 3.9767
    50= 35.919ln(x) - 3.9767
    84.1 = 34.748ln(x) - 2.8986
    50 = 34.748ln(x) - 2.8986
    84.1 = 36.06ln(x) - 1.9789
    50 = 36.06ln(x) - 1.9789
    84.1 = 35.078ln(x) - 1.9115
    50 = 35.078ln(x) - 1.9115
    84.1= 35.147ln(x) - 3.7804
    50 = 35.147ln(x) - 3.7804
    78.4=(1/2)*9.8t²
    x+6/x
    16000=（-20x+2400）*（x-60）
    150×7.94+12×c=（150+c）×7.97

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