,则a的取值范围为( )
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·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1611744448123078e8da5091d4689aef58a461dd11ce9.png" 或<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1611744450663a49bc43c2a574f6dab61a4e0c0ac29eb.png"
出自:运营管理