80.87×0.74-2×11.4×0.86
    80.87×0.656-2×21.9×0.81
    64.4×0.656-2×21.9×0.81
    (64.4)×0.704-2×10×0.839
    (50)×0.704-2×10×0.839
    480.11+18.7×7.46
    462.11+18×1
    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

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