1/1x3+1/3x5+1/5x7+.......1/49x51的简便方法
2个回答
展开全部
1/1x3+1/3x5+1/5x7+.......1/49x51
=1/2 ×[2/(1x3)+2/(3x5)+2/(5x7)+.......2/(49x51)]
=1/2×[(1-1/3)+(1/3-1/5)+(1/5-1/7)+.....+(1/49-1/51)]
=1/2×(1-1/51)
=25/51
=1/2 ×[2/(1x3)+2/(3x5)+2/(5x7)+.......2/(49x51)]
=1/2×[(1-1/3)+(1/3-1/5)+(1/5-1/7)+.....+(1/49-1/51)]
=1/2×(1-1/51)
=25/51
追问
能再简单一点吗
追答
2/1x3=1-1/3
2/3x5=1/3-1/5
2/5x7=1/5-1/7
2/49x51=1/49-1/51
知道这个就行了
下面就应该明白了
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