题目内容
(本小题满分13分)
已知实数满足.
(1) 求的取值范围;
(2) 求的取值范围.
已知实数满足.
(1) 求的取值范围;
(2) 求的取值范围.
(1)
(2)
解:(1) 设P(x,y),Q(– 2,– 1),则
当PQ与圆相切时,设为
由d = r,得,得k = 0或
∴
∴························· 7分
(2) 设,则
∵
∴·········································· 13分
当PQ与圆相切时,设为
由d = r,得,得k = 0或
∴
∴························· 7分
(2) 设,则
∵
∴·········································· 13分
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