求学霸的小说解题

来源：蜘蛛抓取(WebSpider) 时间：2015-09-13 00:18 标签： 求学霸的小说
求学霸解题 _百度作业帮
求学霸解题
求学霸解题&
成功电话疯狂减肥辛苦郭德纲法的经济法
左排：＞＞＞＞右排：＜＞＞＝求学霸解题_百度知道
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采纳发图好吗
剩下的题我一起发啦
可以加我好友。以后帮你做其他的
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你的回答完美的解决了我的问题，谢谢！
灬白兰地可可
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出门在外也不愁3.4乘7乘1.5的简便算法是什么？求学霸解答。_百度知道
3.4乘7乘1.5的简便算法是什么？求学霸解答。
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提问者评价
你的回答完美的解决了我的问题，谢谢！
来自：作业帮
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出门在外也不愁求数学学霸解题!_百度作业帮
求数学学霸解题!
求数学学霸解题!
有解析,看图片发了图片,若看不见请及追问3．已知α∈0,π2,且2sin2α－sin α·cos α－3cos2α＝0,则sinα＋π4sin 2α＋cos 2α＋1＝________． 解析：∵α∈0,π2,且2sin2α－sin αcos α－3cos2α＝0,则(2sin α－3cos α)(sin α＋cos α)＝0,即2sin α＝3cos α.又sin2α＋cos2α＝1,∴cos α＝213,∴sinα＋π4sin 2α＋cos 2α＋1 ＝22（sin α＋cos α）（sin α＋cos α）2＋（－sin2α＋cos2α） ＝268.答案：268 4．若α、β是锐角,且sin α－sin β＝－12,cos α－cos β＝12,则tan(α－β)＝________． 解析：∵sin α－sin β＝－12,cos α－cos β＝12,两式平方相加得：2－2cos αcos β－2sin αsin β＝12,即2－2cos(α－β)＝12,∴cos(α－β)＝34.∵α、β是锐角,且sin α－sin β＝－12＜0,∴0＜α＜β＜π2.∴－π2＜α－β＜0.∴sin(α－β)＝－1－cos2（α－β）＝－74.∴tan(α－β)＝sin（α－β）cos（α－β）＝－73.答案：－73 5．已知函数f(x)＝1－2sin2x－π4cos x.(1)求函数f(x)的定义域； (2)设α是第四象限角,且tan α＝－43,求f(α)的值． (1)函数f(x)要有意义,需满足cos x≠0,解得x≠π2＋kπ,k∈Z,即f(x)的定义域为x|x≠π2＋kπ,k∈Z.(2)∵f(x)＝1－2sin2x－π4cos x ＝1－222sin 2x－22cos 2xcos x ＝1＋cos 2x－sin 2xcos x ＝2cos2x－2sin xcos xcos x＝2(cos x－sin x),由tan α＝－43得sin α＝－43cos α,又sin2α＋cos2α＝1,∴cos2α＝925.∵α是第四象限的角,∴cos α＝35,sin α＝－45,∴f(α)＝2(cos α－sin α)＝145.看得见图片吗?打字不易,下面是问题，学霸可以找我要短文，这是阅读理解。回答后悬赏20，求学霸解答！_百度知道
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1. Susan Boyle is ....答案：D. a Scottish woman.参考原文：....the 47-year-old Scottish woman was famous all over the world.2. Susan Boyle had a look of satisfaction on her face when she was singing because ....答案：A. she was confident about her singing参考原文：.... getting into singing ... it built my confidence3. According to the passage, which is NOT true?答案：C. Susan Boyle became famous because of her appearance.参考原文：The performance was posted online and before long, the 47-year-old Scottish woman was famous all over the world.4. What can we learn about Susan Boyle's success?答案：C. If you have a dream, try to make it come true!参考原文：她唱的那首歌 &I Dreamed to Dream& 就暗示了这是一个梦想成真的故事.原文如下：When we talk about stars, especially female stars, it seems that they are always young, pretty with gorgeous figures. But recently, a Britain's Got Talent star Susan Boyle, changed our views totally. Simon Cowell, one of the judges of the talent show, spoke of his shock over Ms Boyle's voice. &This lady camp up, and I was thinking, this will take five seconds and then I can go to have a cup of tea. That changed when she began to sing &I Dreamed to Dream& from Les Miserables. She knew we were going to have that reaction and just to see that look of satisfaction on her face midway through - it was one of my favorite moments,& Cowell said. The performance was posted online and before long, the 47-year-old Scottish woman was famous all over the world. Speaking from her home in Scotland, Ms Boyle said that she hasn't thought of changing her appearance. She said that her friend helped her with make-up. &I mean, that's hardly a makeover,& she added. Ms Boyle also spoke of the reason she first began to explore her vocal talents. &I was kind of slow at school, so getting into singing was a good way of hiding behind that, and thus it built my confidence. &
提问者评价
太给力了，你的回答完美地解决了我的问题，非常感谢！
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