(a-3)/(3a^2-6a)/(a+2-5/(a-2))
    (sin50*sin18/cos30/cos2)^(1/2)
    (1+(sin50*sin18/cos30/cos2)^(1/2))
    cos(20)*cos20/cos10/cos10/cos30/(1+(sin50*sin18/cos30/cos2)^(1/2))
    cos(20)*cos20/(cos10*cos10*cos30(1+(sin50*sin18/cos30/cos2)^(1/2)))
    cos(20)*cos20
    cos(20)
    1^1/x
    abs(-x）=9
    abs(-x）
    0.0216*4+0.000093×4000+0.0216×2.5×8
    (0.0216*4+0.000093×4000+0.0216×2.5×8)×2
    （0.0425*4+0.000093×4000+0.0425×2.5×8）×2
    1-(√21/√50)^5
    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

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