(1/11+1/33+1/55+1/77)有无简便方法?
问题描述:
(1/11+1/33+1/55+1/77)有无简便方法?
答
(1/11+1/33+1/55+1/77)
=1/11x(1+1/3+1/5+1/7)
=1/11x(105/105+35/105+21/105+15/105)
=1/11x176/105
=16/105
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