定义min{a，b}= {a，a≤bb，a>b ，若函数f（x）=min{x2﹣3x+3，﹣|x﹣3|+3}，且f（x）在区间[m，n]上的值域为[ 3

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定义min{a，b}= {a，a≤bb，a>b ，若函数f（x）=min{x²﹣3x+3，﹣|x﹣3|+3}，且f（x）在区间[m，n]上的值域为[

3

4

，

7

4

]，则区间[m，n]长度的最大值为（）

A：1

B： $\frac{7}{4}$

C： $\frac{11}{4}$

D： $\frac{7}{2}$

上一题下一题 0.0难度选择题更新时间:2019-05-26 04:53:12

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B

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House of Porridge
Welcome to Clark's Porridge House. We have different kinds of porridge. We have meat porridge, vegetable porridge. And fruit porridge is our special, it is only RMB 4 yuan for one bowl. A bowl of meat is RMB 5 yuan. Vegetable porridge is RMB 3 yuan for one bowl, but RMB 5 yuan for two. We have thin pancakes, too. They are RMB 5 yuan for ten. Come and taste the delicious food here. If you are too busy to come, make a telephone call to us and we can send the food to you in 20 minutes.
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