y=log（6—x）为底（4x—7）为真数+x—4分之1的定义域
人气：294 ℃ 时间：2020-05-09 18:50:09
解答
4x-7>0 解得x>7/4
06—x＞0，x＜6，应该还并一个区间（负无穷大，6）对吧底的定义是a>0a≠1就是0<6-x<1或6-x>1
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