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原式=(1-1/3)+(1/3-1/5)+(1/5-1/7)+.+(1/2007-1/2009) =1-1/2009 =2008/2009
16/3開平方等於 根號16/根號3 = 4/根號3 分母有理化.得4根號3/3 答案是:4根號3/3
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