观察下面数列的特点,用适当的数填空,并写出一个通项式1.( ),-4,9,( ),25,( ),49通项公式为什么不可以写成(-1)^(n-1)*n^2?求教!
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![观察下面数列的特点,用适当的数填空,并写出一个通项式1.( ),-4,9,( ),25,( ),49通项公式为什么不可以写成(-1)^(n-1)*n^2?求教!](/uploads/image/z/362711-47-1.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E9%9D%A2%E6%95%B0%E5%88%97%E7%9A%84%E7%89%B9%E7%82%B9%2C%E7%94%A8%E9%80%82%E5%BD%93%E7%9A%84%E6%95%B0%E5%A1%AB%E7%A9%BA%2C%E5%B9%B6%E5%86%99%E5%87%BA%E4%B8%80%E4%B8%AA%E9%80%9A%E9%A1%B9%E5%BC%8F1.%EF%BC%88+%EF%BC%89%2C-4%2C9%2C%EF%BC%88+%EF%BC%89%2C25%2C%EF%BC%88+%EF%BC%89%2C49%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%8F%AF%E4%BB%A5%E5%86%99%E6%88%90%EF%BC%88-1%EF%BC%89%5E%28n-1%29%2An%5E2%3F%E6%B1%82%E6%95%99%21)
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