如题所述
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=(5/4)X(-9/7)X(-16/5)X(-7/24)
=-(5X9X16X7)/(4X7X5X24)
=-9/6
=-3/2
=-1.5
=(5/4)X(-9/7)X(-16/5)X(-7/24)
=-(5X9X16X7)/(4X7X5X24)
=-9/6
=-3/2
=-1.5
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