已知函数 定义域为 ,则 的定义域为( ) A. B. C. D
已知函数定义域为,则的定义域为()A.B.C.D....
已知函数 定义域为 ,则 的定义域为( ) A. B. C. D.
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cpkknuj
推荐于2016-01-21
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试题分析:因为函数 ![](https://iknow-pic.cdn.bcebos.com/b3b7d0a20cf431ad1d20ef884836acaf2fdd9895?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 定义域为 ![](https://iknow-pic.cdn.bcebos.com/30adcbef76094b367560b75ca0cc7cd98c109d95?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,所以 ![](https://iknow-pic.cdn.bcebos.com/377adab44aed2e73ff782a9d8401a18b86d6faea?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,所以 点评:对于抽象函数的定义域,学生应该注意定义域始终指的是自变量 ![](https://iknow-pic.cdn.bcebos.com/728da9773912b31bddfd61988518367adbb4e1ea?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 的取值范围,所以此题中告诉函数 ![](https://iknow-pic.cdn.bcebos.com/b3b7d0a20cf431ad1d20ef884836acaf2fdd9895?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 定义域为 ![](https://iknow-pic.cdn.bcebos.com/30adcbef76094b367560b75ca0cc7cd98c109d95?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,指的是 ![](https://iknow-pic.cdn.bcebos.com/3801213fb80e7becb728af502c2eb9389a506b95?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,而要求 ![](https://iknow-pic.cdn.bcebos.com/aec379310a55b319b4682ec440a98226cefc17e9?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 的定义域,指的是 ![](https://iknow-pic.cdn.bcebos.com/a6efce1b9d16fdfa5c9e6a5fb78f8c5495ee7b95?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 中的 ![](https://iknow-pic.cdn.bcebos.com/728da9773912b31bddfd61988518367adbb4e1ea?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) 的取值范围,所以才有 ![](https://iknow-pic.cdn.bcebos.com/377adab44aed2e73ff782a9d8401a18b86d6faea?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,进而解出 |
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