(2x-1)/(3x+4) = 60%
    2x-1/3x+4=60%
    (2x-400)-(x+100)=X-500
    6.9x-390=（6x-600)*(1+20%)
    -0.3x=-630
     835x = 761.71 890x = 874.78
    a×0.6=229
    675=(x-5)²
    2.75=sqrt(0.5*((98.36/x)^2+(71.77/x)^2+(170.13/x)^2))
    x-(x/1.09*0.03)=678027.38
    x^3+6x^2+8x+15=0
    x-(x/1.09*0.03)=941216.95
    x-(x/1.09*0.03)=991216.95
    （3x-300）*（1+30%）
    1/x＋1/(x＋1)＋1/(x＋4)=1/(x＋2)
    x^3-6x^2+8
    835x+85=761.71
    x=-4/6 log (2，4/6) - 2/6log (2，2/6)
    x=-8/17 log (2，8/17) - 9/17log (2，9/17)
    x=-8/17 log2 (8/17) - 9/17log2 (9/17)

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