作业帮2/15+2/35+2/63+2/99
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2/15+2/35+2/63+2/99
2/15+2/35+2/63+2/99
2/15+2/35+2/63+2/99
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原式
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11
=1/3-1/11
=8/33
此题运用简便计算方法,如有问题请追问,谢谢采纳!
=2/3×5 +2/5×7+2/7×9+2/9×11
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11
=1/3-1/11
=8/33
2/15+2/35+2/63+2/99
=2×﹙1/3x5+1/5x7+1/7x9+1/9x11)
=2×[½×﹙1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11﹚]
=1/3-1/11
=8/33
2/15+2/35+2/63+2/99
=1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11
=1/3-1/11
=8/33
2/15+2/35+2/63+2/99+2/143
2/3+2/15+2/35+2/63+2/99
2/15+2/35+2/63+2/99
1-(2/15+2/35+2/63+2/99)简便
15/2（15分之2）+35/2+63/2+99/2+143/2=多少,
(1/15 1/35 1/63 1/99)*2
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=?
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,
3分之2+15分之2+35分之2+63分之2+99分之2
2/3 2/15 2/35 2/63 2/99用简算怎么算
简算：20-2/3-2/15-2/35-2/63-2/99