180-90-arctan(8/2)-arctan(8/5)+arctan(1.05*8)-arctan(0.014*8)
    74.65*0.014
    25/216/8
    (216/25)^2
    216*216/25/25
    24×（1+25%）
    180-90-arctan(sqrt(10)/2)-arctan(sqrt(10)/5)
    3*(1-0.135)*(1-0.007)
    5.994/0.476
    3+0.426+0.003
    6-0.006
    3+0.003-0.426
    2.339+0.238
    0.142*3
    0.003-5*0.007+2*0.135
    -0.142*3+5*1.007-2*1.135
    0.135+0.007
    3+4.151+1.583
    6-3.166
    3+1.583-4.151

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