255-（1/2）a＝2×(1/2)a
    50k^3-41k^2-10k+9=0
    (2x^2)/(0.1-x)=6.25*(10^-12)
    (2x^2)/(0.1-x)=6.25*10^-12
    (x+6)(34-x)=160
    （x-8）(34-x)=160
    (15-5t)(15-5t)+25=13
    2.9/7.1×30/X=0.04
    （20-x）（32-x）=540
    x^2-4x-1=0
    2x-1=0
    x^2+2x-5040=0
    x^2-4x-1=0
    x*x+6x+36=0
    0.00879-0.92394*x^-0.0815+7-7.90712*x^-0.0196=0
    x+x*0.13=3198
    3a^4+20a^3-719a^2+7620a=21900
    4x＾4-8x＾3+15x＾2-16x+8=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.82166397969319)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.22123378250016)

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