361➗16
    1÷1/3*3
    1697857-1697857*0.2
     arctan((tan(π/3))*(tan(π/3)))
    arctan((tan(π/4))*(tan(π/4)))
    arctan((tanπ/4)(tanπ/4))
    arctan(tanπ/4)(tanπ/4)
    (20+18.0×0.7+19.4×3.4+19.2×0.8+19.8×4.1)×0.61-2×31×0.87
    （19.8×1.5+20×2.5+22×1.8+24×2.9）×4.60+2×19.4×2.14
    19.8×1.5×2.07+2×19.8×1.44
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8+24×5.2)×0.22-2×25×0.47
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×0.22-2×25×0.47
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×0.33-2×20×0.58
    (20+19.4×1.7+19.2×3.1+19.8×3)×0.52-2×54×0.72
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×0.52-2×54×0.72
    (20+19.4×1.7+19.2×3.10)×0.61-2×31.0×0.78
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×0.33-2×20×0.58
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×31×0.87
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×54×0.87
    10-(11/3)

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