1/12+1/20+1/30+1/42+.+1/9900等于多少?
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1/12+1/20+1/30+1/42+.+1/9900等于多少?1/12+1/20+1/30+1/42+.+1/9900等于多少?1/12+1/20+1/30+1/42+.+1/9900等于多少?1
1/12+1/20+1/30+1/42+.+1/9900等于多少?
1/12+1/20+1/30+1/42+.+1/9900等于多少?
1/12+1/20+1/30+1/42+.+1/9900等于多少?
1/12+1/20+1/30+1/42+.+1/9900
=1/(3*4)+1/(4*5)+1(5*6)+...+1/(99*100)
=1/3-1/4+1/4-1/5+1/5-1/6+...+1/98-1/99+1/99-1/100
=1/3-1/100
=97/300
=(1/3-1/4)+(1/4-1/5)+……+(1/99-1/100)=1/3-1/100=97/300
1/12+1/20+1/30+1/42+.......+1/9900=1/3*4+1/4*5+1/5*6+1/6*7+……+1/99*100=1/2-1/3+1/3-1/4+1/4+1/5……+1/99-1/100=1/2-1/100=49/100
可以分解为:
1/(3*4)+1/(4*5)+……+1/(99*100)
1/6+1/12+1/20+1/30+1/42
1/3-1/12-1/20-1/30-1/42
1/6+1/12+1/20+1/30+1/42
1/12+1/20+1/30+1/42+.+1/2450
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
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/12+1/20+1/30+1/42+1/56+1/72+1/90
1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少