4^2+X^2=(10-x)^2
    x^2+x-200=0
    199.65+(104.44+10.9x)(x+3)/2=(107.7x+38.21x*x)/2
    3x^2+4x-5=0
    0.388618x^2+2241.93x-9629222.4=0
    26700+1-（1*10%）/12*3>50000
    3*x^2+2*x-4.2=0
    （932.12+70+x+101+45.82+64.12+80.55+81.7）*0.4=570.16
    26700+X-（X*10%）/12*3>50000
    1144/169
    （932.12+70+64.2+101+45.82+64.12+80.55+81.7）*x=570.16
    (x)^3-(x)^2-x+5=0
    x^2+9x+20
    26700+X-（X*10%）/12*3=24000
    26700+X-X*10%/12*3
    1/6x=1
    4x=(9-x)乘5
    1=-2.4*10^(-11)*x^3+4.7*10^(-7)*x^2-0.0032*x+8.2
    x（6-x）=2
    4x^(2)-3x+0.14>=0

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