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)
    835x=761.71 890x=874.78
    X+2.4x=5.1
    247456*X = 1672*X*(140-0.5*X)+6782400
    247456*X = 1672*(140-0.5*X)+6782400
    1672*148*X=1672*(140-0.5*X)+157*360*120
    (x^2-1)/x-1
    1.6x∧2-13x+10.4＝0
    1.6x2-13x+10.4＝0
    0.0000000000000000851=x（0.01+x）
    0.0000000000000000851=x（0.001+x）
    8.51*10^-17=x（0.001+x）
    2a^2 -a+6=0
    x(1+6x)^6=((0.1-x)(2.3-3x)^3)*(2.1/8.97)*10000000000
    1/4x=-1/4（x-4）(x-4)+4
    -20=x*x-7.75x
    7.04=sqrt(0.5*((281.1/x)^2+(194.6/x)^2+(475.7/x)^2))
    (2x+5)/(3x+7)=5/9

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