!(5)
    0.000004396*0.045*17185.57
    149.987×8.308+250.100×5.308+321.875×0.852+56.945×0.45-378.058×4.56-106.283×0.786
    e3sqrt(9)
    e3
    C(5，0)
    C(3,2)
    1+ln1.2
    sin1.2
    sin1.2
    e0.2
    C(5,1)*C(4,3)
    C(9,4)
    35-17
    arctan1
    3.2*0.6
    0.6*0.6
    5.3%=20 1%=
    5.3%
    20/5.3

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