1/2+1/6+1/12.1/110=

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1/2+1/6+1/12.1/110=
1/2+1/6+1/12.1/110=

1/2+1/6+1/12.1/110=
1/2+1/6+1/12+……+1/110
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/10-1/11)
=1-1/2+1/2-1/3+1/3-1/4+……+1/10-1/11
=1-1/11
=10/11
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原式= (1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/10-1/11)
=1 - 1/11
= 10/11

1/2+1/6+1/12......1/110
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/10-1/11)
=1-1/11
=10/11

1/2+1/6+1/12.1/110= 1/2+1/4+1/6+1/8+1/10+1/12.1/9900怎么算啊? 如图,12.1-6,已知△abc≌△ebd,求证：∠1=∠2 (1-1/2)+(1-1/6)+(1-1/12)+...+(1-1/110)=? 1+1/2-1=1/2 1/3+1/4-1/2=1/12.1/5+1/6-1/3=1/30.1/2013+1/2014-?=1/2013*2014 2/1+6/1+12/1+20/1+30/1+...+110/1=多少. 1/2+1/6+1/12+1/20+1/30+.+1/110=? 1/2+1/6+1/12+.1/90+1/110+1/132=? 1/2-1/6-1/12-1/20-...-1/110 1/2+1/6+1/12+1/20+.1/110=? 帮忙想个题：简算：1/2+1/6+1/12+1/20+.+1/110=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+190+1/110=? 1/2+5/6+11/12+ 109/110=? ∠1=12.1°,∠2=12°6′,比较∠1,∠2的大小,下列说法正确的是 1/2+1/6+1/12+……+1/110 1/2+1/6+1/12+1/20+1/30+1/42...+1/110=?什么规律? 1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?急用! 1/2+1/6+12/+20/+30/+……+1/110=?