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8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255=
人气:240 ℃ 时间:2019-10-27 04:10:52
解答
=8-(1-1/3)-(1/3-1/5)-(1/5-1/7).-(1/15-1/17)
=8-1+1/3-1/3+1/5-1/5.-1/15+1/17
=8-1+1/17=7+1/17
=120/7
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