4x²+26+x=0
    4y²+36=8-y
    6X-X=60
    （6X-X）=60
    (a+5)(a+7)=89999
    (5-x)(5-x)(2-x)
    (6-x)(3-x)(3-x)
    x^2-x^(-2)=4
    m^2-2m-15=0
    ln(x)
    36616x-18400x^2=1154.1
    36616x-18400x^2=1317.07
    2x+4＝8
    1/x+1/(x+2)+(2x+2)/(x^2+2x+2)=1/(x+3)
    （x-15）/x=0.8621
    0.25x^2-149.85x+12877.26＝0
    tanarc0.75
    0.2x^2-192x+18285.71＝0
    -0.4X+0.1（25000-X）=2480
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.135

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