1/3-2/15+3/35-4/63+5/99-6/143
答案:2 悬赏:70 手机版
解决时间 2021-02-05 16:34
- 提问者网友:十年饮冰
- 2021-02-05 03:50
1/3-2/15+3/35-4/63+5/99-6/143=?分数简便计算
最佳答案
- 五星知识达人网友:拾荒鲤
- 2021-02-05 04:53
1/3-2/15+3/35-4/63+5/99-6/143
=[1/3-2/(3×5)]+[3/(5×7)-4/(7×9)]+[5/(9×11)-6/(11×13)]
=1/3×(1-2/5)+1/7×(3/5-4/9)+1/11×(5/9-6/13)
=1/3×3/5+1/7×7/45+1/11×11/117
=1/5+1/45+1/117
=2/9+1/117
=1/9×(2+1/13)
=1/9×27/13
=3/13
=[1/3-2/(3×5)]+[3/(5×7)-4/(7×9)]+[5/(9×11)-6/(11×13)]
=1/3×(1-2/5)+1/7×(3/5-4/9)+1/11×(5/9-6/13)
=1/3×3/5+1/7×7/45+1/11×11/117
=1/5+1/45+1/117
=2/9+1/117
=1/9×(2+1/13)
=1/9×27/13
=3/13
全部回答
- 1楼网友:春色三分
- 2021-02-05 06:00
这种小问题难不倒姐姐我的啦~看着啊 解:1/3-2/15+3/35-4/63+5/99-6/143 =[1/3-2/(3×5)]+[3/(5×7)-4/(7×9)]+[5/(9×11)-6/(11×13)] =1/3×(1-2/5)+1/7×(3/5-4/9)+1/11×(5/9-6/13) =1/3×3/5+1/7×7/45+1/11×11/117 =1/5+1/45+1/117 =2/9+1/117 =1/9×(2+1/13) =1/9×27/13 =3/13
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