（50-x）^0.75＝0.248（x-39）
    （50-x）^0.75＝0.397（x-39）
    36X^2-（2010+3√3）X+90√3+65=0
    1600/x=1440/(x-1)
    1600*x=1440*(x-1)
    29279.5*x∧2-105405300x+10538144000＝0
    120.403*99.975%-x*100.025%=0.5/10
    120.403*99.975%-x*100.025%=1/10
    11.98x^3+84.51x^2+50.15x－474.81＝0
    11.98x^3+84.51x^2+50.15x－474.81＝0
    x+1/x-1-4/x²-1=1
    （209+x）/(524+x)=0.5
    45Y+60*(8-Y)=400
    4000/x-2=4000/(1.25x)
    x²+1120-10000=0
    12.21c=（3.2+c）×7.92
    ln（1+x）
    300x-3x=280+150x
    2lg(2/(x√((x^2+1)(0.25x^2+1))))=-lg(5.8)
    2√(5.9049x^2+1)/(x√((x^2+1)(0.25x^2+1)(0.1024x^2+1))=1

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