题干

已知α是第二象限的角,tanα=
1
2
,则cosα=____
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答案(点此获取答案解析)

2
5
5

同类题3

阅读材料,完成下列要求。

材料一:《三国演义》中有一处描写:

(曹)操发檄文去后,各镇诸侯皆起兵相应:……第二镇,冀州刺史韩馥。第三镇,豫州刺史孔铀。第四镇,兖州刺史刘岱。

《水浒传》中有一处描写:

……参政(参知政事)文彦博出班奏曰:“目今京师瘟疫盛行,伤损军民甚多。伏望陛下释罪宽恩,省刑薄税,祈禳天灾,救济万民。”

材料二:贾政站着,请代儒(贾代儒——私塾老师)坐了,然后坐下。贾政道:“我今日自己送他(指儿子贾宝玉)来,因要求托一番。这孩子年纪也不小了,到底要学个成人的举业,才是终身立身成名之事。还求太爷认真的管教管教他,才不至有名无实的白耽误了他的一世。”(《红楼梦》第八十一回)

……宝玉接着说道:“还提什么念书,我最厌这些道学话。更可笑的是八股文章,拿他诓功名混饭吃也罢了,还要说代圣贤立言。……肚子里原没有什么,东拉西扯,弄的牛鬼蛇神,还自以为博奥。这那里是阐发圣贤的道理。”(《红楼梦》第八十二回)

材料三:王子腾升了都检点,贾雨村补授了大司马,……。(《红楼梦》第二回)

雨村断了此案,急忙作书信两封,与贾政并京营节度使王子腾,不过说“令甥之事已完,不必过虑”等语。(《红楼梦》第四回)

“都检点”是五代时禁军的最高统帅,宋朝初年便被废除了;节度使是唐宋时的官制;元代已经废除……

——甘子清《红楼梦的朝代背景和官制》

同类题4

根据短文内容,完成表格。

    As you know, homework is a big part of going to school. Luckily, here are several suggestions for you to make homework easy.

    Make a homework plan

    Most middle school students have two or three hours of homework a night. If it is a heavy homework day, you may need to spend even more time. It is a good idea to come up with some kind of homework schedule(进度表), especially if you are going to do sports or other activities after school.

    Watch where you work

    A bedroom, study or any room where you can get away from noise is good for you to do your homework. But don't study on your comfortable bed, or you might fall asleep there.

    Take a break

    Most people's attention (注意力) don't last very long, so take some breaks while doing your homework. Sitting for too long without relaxing will make you less productive(多产的) than if you stop to take a break regularly. Taking a 15-minute break every hour is a good way for most people.

    Get help when you need it

    Sometimes even though you are listening carefully in class, some subjects seem too hard. The first person to ask for help is your teacher. He or she may be able to work with you before or after school and explain things more clearly. Your classmates may also be able to give you a hand. However, this might not give you the results you want. Lots of people understand something well but are not able to explain it.

Title: Homework Help

Topic

Homework can be quite hard, but there is something you can do to make homework much ____.

Useful ____

Making a

homework plan

Heavy homework means ____ more time on your study, so it is a good idea to have a homework plan so that you can ____ in all kinds of after-school activities.

____

where you work

It is necessary for you to study in a ____ place, so a bedroom or a study is a good choice.

Taking a break

If you ____ for too long without relaxing, your mind may wander. To keep productive, it is a good idea for most people to have a rest for 15 ____ every hour.

Getting help

The ____ one you can ask for help is your teacher.

You may also get ____ from your classmates but this may not give you what you want.