4*5/9+9*5/14+14*5/19+19*5/24+24*5/29+29*5/34+34*5/39+39*5/44+44*5/49
来源:学生作业帮助网 编辑:作业帮 时间:2024/12/05 22:14:24
4*5/9+9*5/14+14*5/19+19*5/24+24*5/29+29*5/34+34*5/39+39*5/44+44*5/49
4*5/9+9*5/14+14*5/19+19*5/24+24*5/29+29*5/34+34*5/39+39*5/44+44*5/49
4*5/9+9*5/14+14*5/19+19*5/24+24*5/29+29*5/34+34*5/39+39*5/44+44*5/49
通项an=5/[(5n-1)*(5n+4)]=1/(5n-1)-1/(5n+4)
原式=1/4-1/9+1/9-1/14+……+1/44-1/49=1/4-1/49=45/196
计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
计算5/4×9+5/9×14+5/14×19+.+5/34×39+5/39×44+5/44×49
4*5/9+9*5/14+14*5/19+19*5/24+24*5/29+29*5/34+34*5/39+39*5/44+44*5/49
找规律 7 14 10 12 14 9 19 5
简算:9分之14 - 19分之5 - 19分之14 - 9分之5
3/5/(-9/14)
3/14+4/9+11/14+5/9等于多少
17 9 19 8 9 14 9 2 21 4 15 14 7 23 15 4 5 24 9 14 是什么意识?
英语翻译10 9 1- 5 18-:26 8 5-19 8 9-25 9-16 9 1 14-26 8 1 14-23 5 9-14 9-24 9 5-4 5-18 9-26 8 9 -23 15-26 8 9-4 1 15-14 9-2 21-19 8 9-23 15-25 9-7 5-18 5 14-4 5-23 15-2 21-26 8 9-4 1 15-23 15-26 1 9-14 9-24 9 14-26 8 15 14 7-4 1 15-4 9-19 21 1
4,5,5,7,9,11,14,19,23,(),().
5/7+1/4-9/14
求解密数字密码17 9/19 8 9/23 15/19 8 5 14 7/17 9/4 5/25 21 1 14/25 9 14/10 9 21/19 8 9/10 21 5/4 5/14 9/2 21/7 5 21/26 1 9/8 21/23 15/4 5/7 1 14/19 8 15 21/4 21 9/23 15/4 5/20 19/4 21/25 5/4 1/2 21/18 21/25 9/17 9 1 14/12 5/23 15/19 8 5 14/26
0,1,2,3,4,1,3,5,7,9,2,5,8,11,14,3,7,11,15,19,4,9,14,19,24
4 15 14 7 23 5 14 24 9
1/6÷(4-5/14-9/14)
能简算要简算!1.(27/4-19/5)÷4/5 2.(14/29*29+58/9*29)*5/4
10-9/14-5/14简便计算
3/5*14/9-4/9*3/4