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
    0=3*1.5²+（3+x）*1.5+x
    0＝3*1.5²-（3+x）*1.5+x
    14＝-0.02x²+18
    -5＝x²-2x-3
    12.02c=（3.4+c）×7.98
    151×7.95-12=150c
    151.2×7.95-1.2×12=150c
    s(s^2+20s+200)=(s+2)(3s^2+40s+200)
    x^3-30x^2+200x+2000=0
    50%*（X+1/2X）=240
    1/x+2/(x-2)=1/(x-5)
    1/x+1/(x-0.5)=1/(x-1)
    x^2*(x^4+4x^2+36)=36

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