1.22^x=1.54
    1.08^x=1.16
    2.301=（0.0881-2.96）/(1+（X/688）^1.19)+2.96
    2.301=（0.0769-4.22）/(1+（X/961）^1.02)+4.22
    3x－x²
    3x=7
    x²＋1.6×0.00001x－1.6×0.000000001＝0
    x²+x=68
    x²+x=68
    ln(x/(24.791-x)) = -3.39017
    ln[(x/(24.791-x)]=-3.39017
    1.0284x-0.0852=1.431
    1.0284x-0.0852=1.614
    1.0284x-0.0852=1.238
    1.0284x-0.0852=0.376
    x^3=1
    y=2+0.2y+500
    abs(x)=1
    y=（1-0.1）y+700
    y=1-0.7y+700

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