(0.8-0.02×2)×(2.1-0.02)+(1.0-0.02×2)×(2.1-0.02)×14+(0.9-0.02×2)×(2.1-0.02)×8+(1.5-0.02×2)×2+(2.4-0.02×2)×(3.0-0.02)
    (0.8-0.02*2)*(2.1-0.02)+(1.0-0.02*2)*(2.1-0.02)*14+(0.9-0.02*2)*(2.1-0.02)*8+(1.5-0.02*2)*2+(2.4-0.02*2)*(3.0-0.02)
    1÷8-1÷12
    sec0
    1.9782×(2.2×40+6.8×65+4.5×80)
    arctan4-arctan10-arctan0.4-arctan0.2
    arctan0.4-arctan10-arctan0.4-arctan0.2
    arctan4
    1.9782×(2.2×40+6.8×65+4.0×80)
    1.9782×2.2×40+6.8×65+4.0×80
    1.9782×(2.2×40+6.8×65+4.9×80+1.1×130)+0.28×6200×0.31
    1.9782×2.2×40+6.8×65+4.9×80+1.1×130+0.28×6200×0.31
    0.9×(1.0×3.32×16.7+2×1.0×0.086×3.59×360)×4.1×10^5
    √((2300×2300)/410000)
    √(4520000/410000)
    20251119-19610307
    0.9×(1.0×2.36×16.7+2×1.0×0.086×2.56×360)×8.1×10^5
    √(4520000/810000)
    √((2300×2300)/810000)
    (23×(201.06+490.87)×2300)/(2300×2300×80)

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