(206.1×10^6×320.9)/(4.95×10^8 )
    (206.1×10^6×156.1)/(4.95×10^8 )
    (700×7^3)/12+700×7×〖152.6〗^2+(640×7^3)/12+640×7×〖115.6〗^2+(4×7×433^3)/12+4×7×433×〖104.4〗^2
    （1740.89-3.14×1.25×1.25×32）×1×24
    （1740.89-3.14×1.25×1.25×32）×10×8.26
    （1174.98-3.14×1.25×1.25×32）×10×8.26
    (700×7×3.5+640×7×40.5+4×433×7×260.5)/(700×7+640×7+4×433×7)
    arctan-20
    arctan2
    1/2×1.25×〖34.95〗^2×2.05×0.56
    1/2×1.25×〖34.95〗^2×2.2×0.02
    1/2×1.25×〖34.95〗^2×0.5×0.102
    arctan（8.5/3
    32-18+15
    arctan（-1/3）
    arctan4/3
    (1765.2×10^3)/(0.926×31101.8)
    (3849.2×10^3)/(0.926×31101.8)
    (3681.5×10^3)/(0.926×31101.8)
     1.57-arcsin0.75-3.14+2×arctan√7

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