（28.43-18.38）÷28.43
    1/2.7
    1000÷3.677
    1000÷3.784
    1000÷5.013
    4.5×0.75×8
    6√3
    2.94÷9.8
    4.2×10^3*3.5×20
    4.2×10^3*500×20
    0.504÷1.68
    4.2×10^3*15×80
    4.2×10^3*15×20
    4.2×10^7*0.4
    2000×6900
    6.9/((5+45/60)/60)
    6.9/23*240
    (23/4)/60+0/1
    45/60+0
    45/60

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