x(x+1)=2
    19.6x^2-50x+32.6=0
    x^3-3x^2+2x+1=0
    -8+3/x+2.8/(x^2)+2.6/(x^3)+2.4/(x^4)+2.3/(x^5)=0
    (1+r)^6=1.25
    x*ln(x/0.08)=0.265
    16-4x=x^2lnx
    2944x^0.2＋5.44x＝29988
    3*x^3+75*x=2*(25+x^2)^(3/2)
    2400000x^0.2＋4470x=29989
    2*t^2+t+1=1
    x^6+3*x^4-2018*x^3+3*x^2+1
    (5+x)/(30+x)=0.06
    x^6+3x^4-2018x^3+3x^2+1
    x-（x*0.24）-（x*0.16）=7333
    x-（x*0.24）-（x*0.16）=5000
    x-（x*0.24）=5000
    0.0008*117.048^2 - 2*10^(-15)*117.048 + 6*10^(-14)
    0.0008*x^2 - 2*10^(-15)*x + 6*10^(-14)+0.0029*x^2 - 0.0757*x - 41.83=0
    0 = (12-2x)*(12-2x)x

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