等比数列快点......竟没老师答 汗~~!!
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设两个方程x²-ax+1=0 ,x²-bx+1=0的四个根组成以2为公比的等比数列,则ab等于_____
我把两个方程的积分别算出来了都是1,,四个根成等比数列这几项分别是哪个根?
解题思路: 主要利用等比数列的性质求解
解题过程:
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最终答案:略
解题过程:
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最终答案:略