作业帮2/3+2/15+2/35+2/63+2/99+2/132
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2/3+2/15+2/35+2/63+2/99+2/132
2/3+2/15+2/35+2/63+2/99+2/132
2/3+2/15+2/35+2/63+2/99+2/132
原式=2/(1x3)+2/(3x5)+2/(5x7)+2/(7x9)+2/(9x11)+2/(11x12)
=(3-1)/(1x3)+(5-3)/(3x5)+(7-5)/(5x7)+(9-7)/(7x9)+(11-9)/(9x11)+2/(11x12)
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+2/(11x12)
=1+(1/3-1/3)+(1/5-1/5)+(1/7-1/7)+(1/9-1/9)-1/11+2/(11x12)
=10/11+2/(11x12)
=(120+2)/(11x12)
=61/66.
13分之12
2/3+2/15+2/35+2/63+2/99+2/132
=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13
=1-1/13
=12/13
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,