解答题：已知函数y=ax3+bx2，当x=1时，有极大值3 （1）求函数的解析式（2）

题型：解答题

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A very new, young officer(军官)was at a station. He was on his way to visit his mother in another

town, and he wanted to telephone her to tell her the time of this train, so that she could meet him at the

station in her car. He looked in all his pockets, but found that he did not have the right money for the

telephone, so he went outside and looked around for someone to help him.

At last an old soldier (战士) came by, and the young officer stopped him and said, "Have you got

change (零钱) for ten pence?"

"Wait a moment," the old soldier answered. He began to put his hand in his pocket, "I'll see if (是否)

I can help you."

"Don't you know how to speak to an officer?" the young man said angrily (生气). "Now let's start

again. Have you got change for ten pence?"

"No, sir," the old soldier answered quickly.

1. The young officer and his mother lived _____.

A. in the same town

B. in different places

C. in another town

D. in the other town

2. He looked around for help because he _____.

A. had no money to make the phone call

B. did not know where to make the phone call

C. needed some change for the phone call

D. wanted to get change from the old soldier

3. The young officer was angry (生气) because he thought the old soldier _____.

A. was polite to him

B. was not polite to him

C. didn't know how to speak to him

D. didn't like to help him at all

4. Which of the following is not true?

A. Both the young officer and the old soldier were angry.

B. The young officer wanted his mother to meet him at the station.

C. He wanted the old soldier to speak to him in a polite way.

D. He knew the soldier before.

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已知函数y=ax3+bx2，当x=1时，有极大值3 （1）求函数的解析式 （2）