（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
    1.57-arcsin0.75-3.14+arctan√7
    arcsin0.75
    arctan√7
    9/6
    1/2×1.25×〖34.95〗^2×0.9×0.1

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