1.0787x/(20+1000x)=0.0002
    2430/（x+6）＝2160/x
    2430/（x+6）＝7200/x
    2430/x+6＝7200/x
    3x＾2-20x+25=0
    1.0787x/(20+1.0787x)=0.0002
    108x^5+10.8x^4+0.27x^3=2*10^-29
    x/1.639=(1-x)*(1-0.5x)^0.5
    83t×t+76t-60=0
    xxx-18xx+33x-16=0
    x（30-3x）=80
    -3x^2+30x-72=0
    4x+7=23
    x^2-x=-0.09
    x^2-x=0.09
    (x - -sqrt(2)/2 + sqrt(-1/2 + sqrt(2))*(x + -sqrt(2)/2 + sqrt(1/2 + sqrt(2)))*(x + -sqrt(2)/2 + -sqrt(1/2 + sqrt(2)))*x - -sqrt(-1/2 + sqrt(2)) - sqrt(2)/2)=0
    cos（10）x
    1.376cosx+0.75cos2x＝0
    1.376sinx+0.375sin2x＝0.833
    1.376sinx+0.375sin2x

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