
即值域为

……………………………………………………………8分
(2) 解:

令

,则
y=
t2-3
t+2,·························································· 2分
∵
x∈[-2,2],∴

,················································ 4分

,····································································· 5分
当


时,

,当
t=4时,
ymax=6,
∴

········································································· 8分