在正项等比数列an中,a1<a4=1,若集合A={n|(a1-1/a1)+(a2-1/a2)+…+(an-1/an)≤0,n∈N*},则集合A中元素的个数为 (7).为什么,
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![在正项等比数列an中,a1<a4=1,若集合A={n|(a1-1/a1)+(a2-1/a2)+…+(an-1/an)≤0,n∈N*},则集合A中元素的个数为 (7).为什么,](/uploads/image/z/10786102-70-2.jpg?t=%E5%9C%A8%E6%AD%A3%E9%A1%B9%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97an%E4%B8%AD%2Ca1%EF%BC%9Ca4%3D1%2C%E8%8B%A5%E9%9B%86%E5%90%88A%3D%7Bn%7C%28a1-1%2Fa1%29%2B%28a2-1%2Fa2%29%2B%E2%80%A6%2B%28an-1%2Fan%29%E2%89%A40%2Cn%E2%88%88N%2A%7D%2C%E5%88%99%E9%9B%86%E5%90%88A%E4%B8%AD%E5%85%83%E7%B4%A0%E7%9A%84%E4%B8%AA%E6%95%B0%E4%B8%BA+%EF%BC%887%EF%BC%89%EF%BC%8E%E4%B8%BA%E4%BB%80%E4%B9%88%2C)
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