8×11/7
    69.759ln(2136.97515)-498.31
    6E-0.9*1819.95955^3
    680.8*【tan（arccos0.67）-tan（arccos0.92）】
    486*（tanarccos0.77-tanarccos0.92）
    4115226337448559670781893×9
    4115226337448559670781893×27
    !(8)
    arctan2
    sqrt100
    sqrt100111111111
    log(7,9,2)
    lg12
    e2
    e72
    0.78/234
    e
    9^8
    22279-92
    10lg20000

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