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已知集合A={x|x2+4x=0},B={x|x2+2(a+1)x+a2-1=0},问:是否存在实数a使得BA?若存在,请求出实数a的取值范围;若不存在,请说明理由.
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高一上学期数学《2017年9月5日》真题及答案
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