2.1x^2+101.9x+177.8=0
    -1/x+lnx/x
    -1+lnx/x
    42.88x^2(2x/3+2.5)/1.5=2.94(x+9)^2(2x/3-0.5)-405/2+10x^2(x/2+2.5)
    42.88x^2=1
    10.40x^3+67.93x^2-67.85x-2314.13=0
    0.018+x^3=0.609x^2
    b^2=2
    10.40x^3+63.19x^2-4.40x-1475.64=0
    0.212*(0.155-x)=4*x^2
    N(0.5)
    10.40x^3+63.19x^2--4.40x-1475.64=0
    x^3+6x^2-x+2=0
    x＋2＝e∧x
    1.1*298.992*10^6 = 13.8*1900x*(1340-0.5x)
    (2-x)*(1-2*x)^2=(5-x)*(5-2*x)^2
    (2-x)*(1-2*x)^2=(4-x)*(4-2*x)^2
    10.40x^3+83.33x^2+50.12x-1469.2=0
    4=162.7*x*x*(sin(0.000538/x))^2
    （3x+10x^2)^1.67/(3+2*10.05x)^0.67=11.07

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