Question

(本小題滿分16分，每小題8分)
求下列函數(shù)的值域：(1) ；(2) ，．

Answer 1

（1）
（2）

即值域?yàn)?img src="http://thumb.1010pic.com/pic2/upload/papers/20140823/201408231623016521818.gif" style="vertical-align:middle;" />……………………………………………………………8分
(2) 解：
令，則y=t²-3t+2，·························································· 2分
∵x∈[-2，2]，∴，················································ 4分
，····································································· 5分
當(dāng)時(shí)，，當(dāng)t=4時(shí)，y_max=6，
∴········································································· 8分