用“二分法”求方程x3-2x-5=0,在区间[2,3]内的实根,取区间中点为x0

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问题:

用“二分法”求方程x3-2x-5=0,在区间[2,3]内的实根,取区间中点为x0=2.5,那么下一个有根的区间是 ______.

考点:用二分法求函数零点的近似值
题型:填空题

阅读理解。

       My friend Jenny thinks it is very silly to eat too much. She always says she likes a small breakfast. 

  But when I ask her what she eats for breakfast, she says, "Well, I usually start with a glass of orange

  juice. Then I have one or two pieces of bread with butter and a cup of hot chocolate. After that I have

  one or two eggs and some meat. I always have a cup of tea with milk and sugar. Sometimes I have a

  bowl of porridge (麦片粥). I usually finish my breakfast with a cup of coffee. If I'm still a little hungry, I

  often have sandwiches with vegetables. You see, I have a good breakfast every morning. "

       "But how can you call such breakfast small?"

       "I know it is not small. However, that's all I eat. I never eat lunch, and I never have dinner.  If I have

  dinner, I can't sleep. She says with a smile,  "You know, it's stupid to overeat."

根据短文内容判断正(T) 误(F)。

( ) 1. The word "silly" in the first sentence means "clever".

(     ) 2. Jenny never eats lunch.

(     ) 3. Jenny usually has a little breakfast.

( ) 4. Jcnny likes drinking orange juice.

(     ) 5. She has a bad eating habit.

题型:填空题

下列能证明水是由氢和氧两种元素组成的是(  )

A.水的净化

B.水的汽化

C.水的电解

D.水的蒸馏

题型:填空题

冬天,为防止汽车水箱中的水结冰,司机常常在水中加防冻液。加入防冻液后的混合液,低温下不会凝固,长时间开车也不易沸腾。这说明防冻液比纯水的凝固点    ,防冻液比纯水的的沸点     

题型:填空题

账户冻结状态下,可以进行那些操作?()

A.挂失

B.扣划

C.质押

题型:填空题

新入网用户含3G如果向下变更套餐,要求在入网()个月以后,如果向上变更套餐,只要当月收取全月套餐即可办理,当月办理,()生效。

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