急!观察下面三行数: ①2,-4,8,-16,32,-64... ②0,-6,6,-18,30,-66... ③-1/2,1,-2,4,-8,16... （1）分别写出3行数的规律（2）取每行中第10个数的和是（）.
跪求啊!明天要交!
人气：190 ℃ 时间：2019-10-17 05:36:25
解答
①2,-4,8,-16,32,-64（间隔数乘以4得到后一个数）②0,-6,6,-18,30,-66...（0到-6是加-6得到的.-6到6是+12得到的.6到-16是-24得到的.也就是前一个数是后一个数相差数的-2倍）③-1/2,1,-2,4,-8,16...（间隔数乘以4得到...
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