x4-x
    m^3+5m^2+m+3=0
    m3+5m2+m+3=0
    arctan(x)=45
    arctan(x)=1
    arctan(x)=1
    arctan(0.2x)-arctan(x)-arctan(0.01x)=-90
    3x²+13x+2=0
    [x+（9-x)]²=45
     x×x-2x-5=0
    X^4+X^5+X^6=3.38759
    n×n+(n+2)=274
    x (51-2x)=210
    A+1.02A/0.03*0.3336 =30
    A+1.02A/0.03*0.3336
    （5000A-300）/2000=22%
    3X²-X-2/X
    4.2x-X+3.42=6.3
    1.652=0.0001a^2-0.0166a+2.016
    ((0.1-0.2x)/0.3)-1=(0.7-x)/0.4

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