(242.56×4+401.13×4)×10^6
    arccos（0.6833）
    439×(1-4/(4×2))
    326×(1-3/(4×2))
    439×2+439+366
    439×(1-1/(3×2))
    3600/214×0.9×[(60-4)/2+1]
    326+326+217
    326×(1-2/(3×2))
    3600/214×0.9×[(45-4)/2+1]
    (3600×0.9×[(45-4)/2+1])/214
    2019÷（2020/2021）
     2019÷2020/2021
    3.1415926/28.096562
    3.1415926/54.214885
    3.1415926/52.74719
    3.1415926/4.743966
    (3.353516 ^2+0.2)*3.353516 *sin3.353516 -2*(0.1*3.353516 ^2)*cos3.353516
    (3.201^2+0.2)*3.201*sin3.201-2*(0.1*3.201^2)*cos3.201
    3.14/3.353516

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