函数f﹙x﹚=2x-1/log₃X的定义域为A﹙0,正无穷﹚ B﹙1,正无穷﹚ C ﹙0,1﹚ D﹙0,1﹚∪﹙1,正无穷﹚
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 14:04:39
![函数f﹙x﹚=2x-1/log₃X的定义域为A﹙0,正无穷﹚ B﹙1,正无穷﹚ C ﹙0,1﹚ D﹙0,1﹚∪﹙1,正无穷﹚](/uploads/image/z/5925901-13-1.jpg?t=%E5%87%BD%E6%95%B0f%EF%B9%99x%EF%B9%9A%EF%BC%9D2x%EF%BC%8D1%EF%BC%8Flog%26%238323%3BX%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAA%EF%B9%990%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%B9%9A+B%EF%B9%991%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%B9%9A+C+%EF%B9%990%2C1%EF%B9%9A+D%EF%B9%990%2C1%EF%B9%9A%E2%88%AA%EF%B9%991%2C%E6%AD%A3%E6%97%A0%E7%A9%B7%EF%B9%9A)
函数f﹙x﹚=2x-1/log₃X的定义域为A﹙0,正无穷﹚ B﹙1,正无穷﹚ C ﹙0,1﹚ D﹙0,1﹚∪﹙1,正无穷﹚
函数f﹙x﹚=2x-1/log₃X的定义域为
A﹙0,正无穷﹚ B﹙1,正无穷﹚ C ﹙0,1﹚ D﹙0,1﹚∪﹙1,正无穷﹚
函数f﹙x﹚=2x-1/log₃X的定义域为A﹙0,正无穷﹚ B﹙1,正无穷﹚ C ﹙0,1﹚ D﹙0,1﹚∪﹙1,正无穷﹚
log₃X,得:x>0
因为分母不能为0,所以log₃X≠0
x≠1
所以选D﹙0,1﹚∪﹙1,正无穷﹚
中间那个是减号?是的话,答案D
分母不能是0,所以(0,真无穷)之间扣掉1,