1/2+1/6+1/12+1/20.1/110怎样计算?

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1/2+1/6+1/12+1/20.1/110怎样计算?
1/2+1/6+1/12+1/20.1/110怎样计算?

1/2+1/6+1/12+1/20.1/110怎样计算?
1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+.+(1/10-1/11)
=1/2+1/2-1/11
=1-1/11
=10/11

1/2+1/6+1/12+1/20......1/110
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/10-1/11
=1-1/11
=10/11

2=1*2
6=2*3
20=4*5
=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+1/20......1/110
＝1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+......+(1/10-1/11)
=1/2+1/2-1/11
=1-1/11
=10/11

1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+......+(1/10-1/11)
=1/2+1/2-1/11
=1-1/11
=10/11

计算1/2+1/6+1/12+1/20.1/90 1/2+1/6+1/12+1/20.1/110怎样计算? 利用因式分解计算:(1)39×37－13×81; (2)29×20.1＋72×20.1＋利用因式分解计算:(1)39×37－13×81; (2)29×20.1＋72×20.1＋13×20.1－20.1×14 4.6×20.1-0.46×1简便算法 4.6×20.1-0.46×1的简便算法 1/2+1/6+1/12+1/20.+1/380 2%1+6%1+12%1+20%1+30%1 1/2+1/6+1/12+1/20+1/30 1/2-1/6-1/12-1/20-...-1/110 1/2,-1/6,1/12,-1/20,1/30 2/1+6/1+12/1+24/1+48/1 1/2+1/6+1/12+1/20+.1/90 2/1+6/1+12/1+20/1+...+2450/1 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1+1/2+1/12+1/6+1/20+1/30+1/40+1/56 (1-1/2)+(1-1/6)+(1-1/12)+...+(1-1/110)=? 1/2+1/6+1/12+...+1/4054182 等于多少?