(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
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8+24×2.9)×4.59+2×25×2.14
     2×54×1.43
    （19.8×1.5）×2.07+2×54×1.43
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8+24×5.2)×4.59+2×25×2.14
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×4.59+2×20×2.14
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5+22×1.8)×3+2×20×1.73
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×3+2×40×1.73
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×1.90+2×40×1.38
    (20+19.4×1.7+19.2×3.1+19.8×3)×1.90+2×54×1.38
    (20+19.4×1.7+19.2×3.10+19.8×3)×0.61-2×54.0×0.87
    (20+19.4×1.7+19.2×3.10+19.8×1.5)×2.07+2×54.0×1.43
    (20+19.4×1.7+19.2×3.10)×2.07+2×31×1.43
    （19.8×2.7+20×1）×0.50+2×40×0.71
    （19.8×2.7）×0.50+2×54×0.71

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