x^2-(4/9)*x+4/81=0
    x/358.2/(x/358.2+100/18)=0.0001404
    3X-1.5=15
    15k^2+3.9k+0.46=1
    15k^2+3.9k+0.46=
    180833-152.507*（900+273.15）+8.314*（900+273.15）ln[(100/x)-1]
    X+X*0.13=1799
    （a-25）×0.000019=0.015
    sin（3.14*x）+sin(3.93-6.28*x)+9.53*sin（3.14*x）*sin（3.14*x）*sin（3.14*x）=38795.91
    1+x=3
    6cosx-6xsinx
    70/X+50/x^2+20/x^3=100
    log(2,x^2)-1=0
    sin（π*x）+sin(1.25*π-2*π*x)+3.03*π*（sin（π*x））^3=12345.94*π
    tanx-x=9.4241
    cosx=0
    6xcosx=0
    0.4x^2+1.35x^1.5+1.208x=8.38
    0.2025x^2+1.25x-0.81=0
    ex=4-xx

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