求下列函数的定义域: (1)y=x+2+1/x2−x−6; (2)y=(x+1)0|x|−x.
问题描述:
求下列函数的定义域:
(1)y=
+
x+2
;1
x2−x−6
(2)y=
. (x+1)0
|x|−x
答
(1)y=x+2+1x2−x−6的定义域满足:x+2≥0x2−x−6≠0,解得x>-2且x≠3.∴y=x+2+1x2−x−6的定义域为(-2,3)∪(3,+∞).(2)y=(x+1)0|x|−x的定义域满足:x+1≠0|x|−x≠0,解得x<0且x≠-1,∴y=(x+1)0|x|...