1-(√21/√50)^4
    1-(√21/√50)^3
    1-（√21/√50）^2
    1-(√21/√50）
    -20*lg(0.5254)
    8.94*(0.04*8.94^2+1)^0.5*((0.0625*8.94)^2+1)^0.5/40
    x+0.0121*x+(x+0.0121*x)*0.0292+（x+0.0121*x+(x+0.0121*x)*0.0292）*0.09=2119892.41
    x+0.0121*x+(x+0.0121*x)*0.0292+（x+0.0121*x+(x+0.0121*x)*0.0292）*0.09=113.55
    100+0.0121*100+(100+0.0121*100)*0.0292+（100+0.0121*100+(100+0.0121*100)*0.0292）*0.09
    90-arctan(0.2*12.14)-arctan(0.0625*12.14)
    arctan(0.034*66.5)-90-arctan(0.0068*66.5)-arctan(0.1*66.5)
    1/66.5/0.2^0.5
    arctan(0.032*64)-90-arctan(0.00752*64)-arctan(0.1*64)
    arctan(0.32*64)-90-arctan(0.00752*64)-arctan(0.1*64)
    1/64/0.235^0.5
    90-arctan(4.4166)
    (44-x)(6-2x)^2=(16-x)(7-2x)^2
    (6-x)(44-2x)^2=(7-x)（18-2x）^2
    0.0007x=3^2x
    (0.00017-x)(0.00126-2x)^2=(0.0002-x)(0.0005-2x)^2

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