(20+18.0×1.6+19.2×2.4+19.8×2.3)×0.48-2×31×0.70
    (20+18.0×1.6+19.2×2.4)×0.48-2×31×0.70
    (20+18.0×1.6+19.2×2.4+19.8×2.3)×0.61-2×31×0.87
    (20+18.0×1.6+19.2×2.4)×0.61-2×31×0.87
    (20+18.0×1.6+19.2×2.4)×0.61-2×31.0×0.78
    (20+18.0×1.6)×0.61-2×10×0.78
    （20+1.6×18）×0.7-2×10×0.84
    (20×0.52×1.65^2)/2×(19.8×0.52×1.65^3)/6
    (20+18.0×0.7+19.4×3.4+19.2×0.8+19.8×1.4)×0.61-2×54×0.87
    (20+18.0×0.7+19.4×3.4+19.2×0.8+19.8×4.1+20×0.6)×0.52-2×40×0.72
    (20+19.8×2.7+19.2×0.6)×1.90+2×40×1.38
    （19.8×2.7）×2.07+2×54×1.43
    (20+19.8×2.7)×1.90+2×54×1.38
    (20+19.8×2.7+19.2×1)×1.90+2×40×1.38
    (20+19.8×2.7+20×1)×3+2×40×1.73
    (20+19.8×2.7+20×1+22×1.6)×3+2×20×1.73
    (20+19.8×2.7+20×1+22×1.6)×4.59+2×20×2.14
    (20+19.8×2.7+20×1+22×1.6+24×5.3)×4.59+2×25×2.14
    2^2020＋(-2)^2020
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8+24×2.9)×0.22-2×25×0.47

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