C(C(5,3)，C(4,2))
    1.1＋1.91＋1.991＋1.9991＋1.99991＋1.999991＋1.9999991＋1.99999991＋1.999999991
    1＋0.9＋0.8＋0.7＋0.6＋0.5＋0.4＋0.3＋0.2＋0.1 0.1×1.3＋0.2×1.2＋0.3×1.1＋0.4×1＋0.5×0.9 1＋｛[(77×78－6)-5679]÷107＋30｝×37 12－[0.2×(3＋1.5)＋1.1]÷[7.5－(3－2.5)×5]
    3＋36
    4＋27
    5＋25＝
    2/924
    C(12,6)
    A(0.6,32) B(1.5,200) C(3,465)
    0.38＋0.00592＋0.00000592＋0.00000000592＋0.00000000000592 17＋0.26＋0.005＋0.0005＋0.00005＋0.000005＋0.0000005 4＋0.69＋0.0069＋0.000069＋0.00000069＋0.0000000069 3＋0.17＋0.0092＋0.0000592＋0.0000000592＋0.0000000000592
    1.1×1×0.9＋1×0.9×0.8＋0.9×0.8×0.7＋0.8×0.7×0.6 1.11×2.22×3.33×4.44÷5.55÷6.66×(1－0.37×3＋0.11) (1－0.25)÷[12×(1－0.75)＋1.5×0.6]×(1.2－0.6÷20)＋1.5×2.5 1.1＋1.91＋1.991＋1.9991＋1.99991＋1.999991＋1.9999991＋1.99999991
    (0.9×0.8×0.7)÷(0.6×0.5×0.4×0.3×0.2×0.1)
    527889.96:9600
    451188:9600
    9600*25
    527889.96 - 360950.4
    9600*37.599
    90237.6+451188(1-3%)
    451188*0.97
    37.599 * 2400

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