425.63+19.2×1.9
    80.87+16.9×20.4
    64.4+18.3×0.9
    50+18×0.8
    (（11.47×16.9+1.9×19.2+1×18+7.46×18.7）×3.14+22.6×9.59)/(0.8×18+0.9×18.3+20.4×16.9+1.9×19.2+1×18+7.46×18.7+50)
    0.8×18+0.9×18.3+20.4×16.9+1.9×19.2+1×18+7.46×18.7+50
    11.47×16.9+1.9×19.2+1×18+7.46×18.7
    11.47×16.9+1.9×19.2+1×18+7.46×18.7
    49^10
    49^9
    49^20
    10^20
    10^920
    2^7
    0.52×0.426
    1.0×1.3×1.00×0.40
    1/2×1.25×〖38.90〗^2×2.0×0.426
    1.35×29.48
    2.0×29.48
    1.02×1.0×1.00×28.9/1.00

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