观察下面的数:(1)-3,9,-27,81,-243,729.(2)0,12,-24,84,-243,729.(3)-1
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观察下面的数:(1)-3,9,-27,81,-243,729.(2)0,12,-24,84,-243,729.(3)-1,3,-9,27,-81,243.
取每行第10个数,计算这3个数的和
取每行第10个数,计算这3个数的和
![观察下面的数:(1)-3,9,-27,81,-243,729.(2)0,12,-24,84,-243,729.(3)-1](/uploads/image/z/1858389-69-9.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E9%9D%A2%E7%9A%84%E6%95%B0%3A%281%29-3%2C9%2C-27%2C81%2C-243%2C729.%282%290%2C12%2C-24%2C84%2C-243%2C729.%283%29-1)
第二个数列好像有点问题
:(1)-3,9,-27,81,-243,729.数列为(-1)^n *3^n 3^10
2)0,12,-24,84,-243,729.数列为
3)-1,3,-9,27,-81,243……数列为 (-1)^(n) *3^(n-1) 3^9
:(1)-3,9,-27,81,-243,729.数列为(-1)^n *3^n 3^10
2)0,12,-24,84,-243,729.数列为
3)-1,3,-9,27,-81,243……数列为 (-1)^(n) *3^(n-1) 3^9
观察下面的数:(1)-3,9,-27,81,-243,729.(2)0,12,-24,84,-243,729.(3)-1
观察下面的数:(1)3,-9,27,-81,243,-729.(2)1,-7,25,-79,241,-727.(3)1,
观察下面三行数:1:-3,9,-27,81,-243;2:0,12,-24,84,-240;3:-1,3,-9,27,-
观察下面三行数:1:-3,9,-27,81,-243;2:0,12,-24,84,-240;3:1,-3,9,-27,8
标准检测卷观察下面三行数:-3,9,-27,81,-243,729……0,12,-24,84,-240,732……-1,
观察下面的数的排列规律,在空格处填上恰当的数:-1,3,-9,27,______,243,…
观察下面三行数-3 ,9,-27,81,-243……:① 0,12,-24,84,-240……;② 3,-9,27,-8
观察下面各行数①-3,9,-27,81,-243,729……②0,12,-24,84,-240,732……
观察下面三行数:-3,9,-27,81,-243,...-5,7,-29,79,-245,...-1,3,-9,27,-
观察下面一列数,按规律填写适当的数1/2,-3/6,5/12,-7/20___,___.
观察下面各数:3、9、27、81、243、729 1,7,25,79,241,727,1,3,9,27,81,243
观察下面三行数,-3,9,-27,81,-243…… 1,13,-23,85,-239…… 1,-3,9,-27,81