已知a=3/4,求a(1+a)/(1-a3)+a3(1+a3)/(1-a9)+a9(1+a9)/(1-a27)的整数部分不晓得怎么来的
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![已知a=3/4,求a(1+a)/(1-a3)+a3(1+a3)/(1-a9)+a9(1+a9)/(1-a27)的整数部分不晓得怎么来的](/uploads/image/z/12644491-67-1.jpg?t=%E5%B7%B2%E7%9F%A5a%3D3%2F4%2C%E6%B1%82a%281%2Ba%29%2F%281-a3%29%2Ba3%281%2Ba3%29%2F%281-a9%29%2Ba9%281%2Ba9%29%2F%281-a27%29%E7%9A%84%E6%95%B4%E6%95%B0%E9%83%A8%E5%88%86%E4%B8%8D%E6%99%93%E5%BE%97%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84)
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