观察下面三行数:2,-4,8,-16,32,-64,...;① 4,-2,10,-14,34,-62...;②观察下面三行数:①2,-4,8,-16,32,-64,...; ② 4,-2,10,-14,34,-62...③1,-2,4,-8,16,-32,...写出每行第五十个数要有列式
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