(6分)觀察下面的變形規(guī)律:
 =1-;;……
解答下面的問題:
(1)若n為正整數(shù),請你猜想                 ;
(2)證明你猜想的結(jié)論;
(3)求和:+…+ .
(1)·············································································· 1分
(2)證明:.····················· 3分
(3)原式=1-+…+
.································································· 5分解析:
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