题目内容

(本小题满分10分)
判断x∈[0,3])的单调性,并证明你的结论.
f(x)在[0,3]上递增,证明略。
解:,∴f(x)在[0,3]上递增,·········································· 2分
证明:f(x+h)-f(x)=,······················· 6分
x + hx∈[0,3],
x + h + 1 > 0,x + 1 > 0,························································ 8分
又∵h > 0,
f ( x + h)- f (x)> 0,········································· 9分
f (x) 在[0,3] 上递增.······················································· 10分
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