2^30-1
    2^162-1
    55223880597*37
    55223880597*27
    55223880597*17
    55223880597*7
    5.5/（1+1/4×（2.75-1.25））
    (1.21×9.8×3.5)/(4×0.82)
    (31.2+0.87)/4+(4.65×2.65)/(2.675×2.675×4)+(5.57×3.2)/(3.2×3.2×4)
    88400:44
    88:44
    88400:44
    22.9/2.1%
    88.4/4.4%
    88.4/4.4%/22.9/2.1%
    88.4/4.4%/22.9/2.1%
    9.5+0.2+0.64+7.3
    1020236528*45263598781=
    1020236528*45263598781=
    1/2*4√6*2√2

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