2/3+2/15+2/35+2/63+2/99用简算怎么算
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2/3+2/15+2/35+2/63+2/99用简算怎么算
2/3+2/15+2/35+2/63+2/99用简算怎么算
2/3+2/15+2/35+2/63+2/99用简算怎么算
1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11=10/11
2*[1/1*3+1/3*5+1/5*7+1/7*9+1/9*11]=(1/1-1/3)+(1/3-1/7)+(1/7-1/9)+(1/9-1/11)=1-1/11=10/11
解:原式=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11
=1-1/11
=10/11
这个式子可以扩展的,结果都等于1-1/(n+1)=n/(n+1).
2/3+2/15+2/35+2/63+2/99
2/3+2/15+2/35+2/63=?
2/3+2/15+2/35+2/63简便运算
1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
2/15+2/35+2/63+2/99+2/143
简便计算:3/2+15/2+35/2+63/2+99/2+143/2
2/3+2/15+2/35+2/63+2/99+2/143=?
2/3+2/15+2/35+2/63+2/99+2/132
3/2+15/2+35/2+63/2+99/2+132/2的简便算法
简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
2/15+2/35+2/63+2/99
1-(2/15+2/35+2/63+2/99)简便
2/15+2/35+2/63+.+2/323=
计算:2/3+2/15+2/35+2/63+......+2/9603=?
计算:2/3+2/15+2/35+2/63+2/99=?
2/3+2/15+2/35+2/63+2/99用简算怎么算
简便计算:20-2/3-2/15-2/35-2/63-2/99
2/3+2/15+2/35+2/63+2/99 简便计算,