33.7×0.7556-2×10×0.8693
    arccos（1/（40）^0.5）
    arctan2
    arctan9-arctan3
    1/2×1.25×〖34.32〗^2×1.4×0.4
    1/2×1.25×〖34.32〗^2×1.4×0.6
    1/2×1.25×〖34.32〗^2×2.0×0.12
    1/2×1.25×〖34.32〗^2×2.0×0.22
    (10×4×2.5×16+100)/(10×4)
    (10×4×2.5×20+100)/(10×4)
    1.9782×(2.2×40+6.8×65+4.5×80)
    (0.8-0.02×2)×(2.1-0.02×2)×4+(0.8-0.02×2)×(2.1-0.02×2)×3+(1.6-0.02×2)×(2.1-0.02×2)×4+(1.6-0.02×2)×(2.1-0.02×2)×(1.0-0.02×2)×(2.1-0.02×2)+(1.0-0.02×2)×(2.1-0.02×2)+(1.5-0.02×2)×(2.1-0.02×2)×5+(1.3-0.02×2)×(3.45-0.02×2)+(2.4-0.02×2)×(2.0-0.02×2)
    (2.1-0.02×2)×(2.85-0.02×2)×2+(2.1-0.02×2)×(1.95-0.02×2)×4+(1.55-0.02×2)×(3.45-0.02×2)×2
    (1.3-0.02×2)×(2.85-0.02×2)+(1.8-0.02×2)×(2.85-0.02×2)+(2.1-0.02×2)×(2.85-0.02×2)×6+(1.3-0.02×2)×(1.95-0.02×2)×2+(1.8-0.02×2)×(1.95-0.02×2)×2+(2.1-0.02×2)×(1.95-0.02×2)×19+(1.3-0.02×2)×(3.45-0.02×2)+(1.5-0.02×2)×(3.45-0.02×2)+(1.55-0.02×2)×(3.45-0.02×2)×2+(1.8-0.02×2)×(3.45-0.02×2)+(2.1-0.02×2)×(3.45-0.02×2)×2+(1.8-0.02×2)×(2.0-0.02×2)
    (0.8-0.02×2)+(2.4-0.02)
    (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)
    (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)

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