8:5
    180:112.5
    2+1/3-1-3/8-5/6
    -(32+16/25)/(-8*4)-(2+1/3-1-3/8-5/6)*(-24)
    -arccos0
    -arccos（-1）
    √(30.47-0.19*157.94)
    √(30.47-0.19*120)
    √(30.47-0.19*90)
    √(30.47-0.19*60)
    √(30.47-0.19*30)
    √(30.47-0.19*0)
    √(30.47+0.19*10)
    √(30.47+0.19*30)
    √(30.47+0.19*52.35)
     (10^(-7) (24.6^2-2.77^2 ))/52+(10^(-10)(24.6-2.77)*7.5)/0.8
    (10^(-7) (68^2-7.77^2 ))/52+(10^(-10)(68-7.77)*7.5)/0.8
    (10^(-7) (66^2-5.52^2 ))/52+(10^(-10)(66-5.52)*7.5)/0.8
    0.002786/1.506972095
    0.004027136-0.001241

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