(本小題滿分10分)
判斷(x∈[0,3])的單調(diào)性,并證明你的結(jié)論.
f(x)在[0,3]上遞增,證明略。
【解析】解:,∴f(x)在[0,3]上遞增,·········································· 2分
證明:f(x+h)-f(x)=,······················· 6分
∵ x + h,x∈[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] 上遞增.······················································· 10分
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