4000000-200000n+2482.984375n^2=0
    k^2 * ( (0.04*50)^2 + 1 ) / ((50^2 * (0.15*50)^2 + 1 ) * ( (0.000877*50)^2 + 1 ) * ( (0.005*50)^2 + 1 )) = 1
    atan(t*50)-90-atan(0.000877*50)-atan(0.005*50)=-130
    atan(t*50)-90-atan(0.000877*50)-atan(0.005*50)=-130
    -2.19x^2-2.96x-3.46=0
    x^5+10x^3+20x-4=0
    atan(t*50)-90-atan(0.000877*50)-atan(0.005*50)=-130
    x^3-50x^2+600x-2000
    k^2 * ( (0.04*50)^2 + 1 ) / (50^2 * (0.15*50)^2 + 1 ) * ( (0.000877*50)^2 + 1 ) * ( (0.005*50)^2 + 1 ) = 1
    x=tanx
    3（2-3x）-3[3（2x-3）+3]=5
    x^3-40x^2+500x-2000
    x^3-40x^2+500-2000
    k^2-304k-1680＝0
    5.103×10^(-8)×(x+273.15)^4-20x-128.013586=0
    1/d+1/（d+2）+1/（d+3）+1/（d+4）＝1/（d+1）
    2=100×（x-216）/（x×1350/100）
    x^2-60x+600
    x^3-180x^2+7800x-72000
    2m^3+3m-5

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