观察下列一组数:1、-3/2,5/4,-7/8,9/16第n个数是_____2、-x,+x,-x,+x,第n个数是_____3、+x,-x,+x,-x,第n个数是_____
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![观察下列一组数:1、-3/2,5/4,-7/8,9/16第n个数是_____2、-x,+x,-x,+x,第n个数是_____3、+x,-x,+x,-x,第n个数是_____](/uploads/image/z/2500985-65-5.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E5%88%97%E4%B8%80%E7%BB%84%E6%95%B0%3A1%E3%80%81-3%2F2%2C5%2F4%2C-7%2F8%2C9%2F16%E7%AC%ACn%E4%B8%AA%E6%95%B0%E6%98%AF_____2%E3%80%81-x%2C%2Bx%2C-x%2C%2Bx%2C%E7%AC%ACn%E4%B8%AA%E6%95%B0%E6%98%AF_____3%E3%80%81%2Bx%2C-x%2C%2Bx%2C-x%2C%E7%AC%ACn%E4%B8%AA%E6%95%B0%E6%98%AF_____)
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观察下列一组数:1、-3/2,5/4,-7/8,9/16第n个数是_____2、-x,+x,-x,+x,第n个数是_____3、+x,-x,+x,-x,第n个数是_____
观察下列一组数:
1、-3/2,5/4,-7/8,9/16第n个数是_____
2、-x,+x,-x,+x,第n个数是_____
3、+x,-x,+x,-x,第n个数是_____
观察下列一组数:1、-3/2,5/4,-7/8,9/16第n个数是_____2、-x,+x,-x,+x,第n个数是_____3、+x,-x,+x,-x,第n个数是_____
1、-3/2,5/4,-7/8,9/16,.,第n个数是 (-1)^n * (2n+1) / (2n)
2、-x,+x,-x,+x,.,第n个数是 (-1)^n * x
3、+x,-x,+x,-x,.,第n个数是 (-1)^(n+1) * x