计算下列各式：_刷题宝

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计算下列各式：

上一题下一题 0.0难度选择题更新时间:2018-06-21 10:41:58

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同类题1

下列命题中，其中正确的命题个数有（）

（1 ）已知⊙O的半径为1，AB是⊙O的一条弦，且AB= $\sqrt{3}$ ，则弦AB所对圆周角的度数为60度；

（2 ）已知⊙O的半径为5，圆心O到弦AB的距离为3，则⊙O上到弦AB所在直线的距离为2的点有3个；

（3 ）平分弦的直径垂直于弦；

（4 ）已知点P是线段AB的黄金分割点，若AB=1，AP= $\frac{\sqrt{5} - 1}{2}$ ．

同类题2

Questionnaire
Read the questions and answer Yes or No , then you will find out how good you are.
1. When you don’t understand something, you ask questions.
2. You like listening to older people talk about the past.
3. You think that you can learn something interesting from everyone around you.
4. You are brave enough when you have to talk to people you don’t know.
5. You enjoy reading books about famous people.
6. You always see and talk to different people.
7. You are interested in learning new ways of doing things.
8. You enjoy sharing experiences with friends and learning from people of all ages.
9. You talk a lot about yourself.
10. Even if you are often wrong, you make your own decisions.
11. You hate teaching what you are good at: sports, technology, whatever.
12. Your parents don’t understand you, so you don’t talk to them much.

SCORE NOW!
Score 2 points if you answer YES to each of the first 8 questions, and 0 if you choose NO.
Score 2 points if you answer NO to each of the last 4 questions, and 0 if you choose Yes.
18-24 You are friendly and open-minded. You make people feel important by listening to what they have to say. You’ll probably succeed in learning all kinds of interesting things. Good for you!
10-16 Remember that every single person you know can teach you something. You will greatly make your life rich and colorful.
0-8 About 400 years ago, a famous writer wrote , “No man is an island.” This is still true today. Try to be more open and interested in people around you.

同类题3

写出下列各词的反义词。

漂亮-----____ 特殊-----____

严寒-----____ 麻烦-----____

同类题4

从一个水龙头打水，有人用大桶，有人用小桶。无论让谁先打，全部打完水的时间是一样的，因为水龙头的流速是一样的。但就效率而言，先让用小桶的人打水会缩短所有人打水的总时间，一定时间内可以让更多的人完成打水的任务，体现了短作业优先法。这说明（）

①促进公平需要合理的机制 ②合理的公平表现为相对平等

③效率是公平的物质前提和保证 ④效率的提高意味着社会财富的增加

同类题5

，则下列不等式中正确的是（）

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