2/5-(5/12-54/247÷9/26
    2/5-(5/12-54/247:9/26)
    2/5-(5/12-54/247：9/26)
    12×60÷5÷0.002×99.8÷5÷96590
    12×60÷5÷0.002×99.8÷5÷93908
    12×60÷5÷0.002×99.8÷5÷16658
    12×60÷5÷0.002×99.8÷5÷1342
    12×60÷5÷0.002×99.8÷5÷96191
    12×60÷5÷0.002×99.8÷5÷35839
    12×60÷5÷0.002×99.8÷5÷23784
    12×60÷5÷0.002×99.8÷5÷60206
    12×60÷5÷0.002×99.8÷5÷9504
    12×60÷5÷0.002×99.8÷5÷31762
    12×60÷5÷0.002×99.8÷5÷5251
    205/9
    180/π
    (4×78.54)/(360×1142)
    (（879.55-914.514）*10^3/(360×1142)
    3.6×1.5÷2×1.8
    3.6×1.5÷5×1.8

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