作业帮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=?