真正的英雄阅读题答案

若3sina^2+2sinb^2=2sina,求sina^2+sinb^2的取值范围? 如果2204年是闰年,那为什么2200年不是闰年呢?1900,1800,1700年也是 2200年是闰年呵一? 公式：＝SUM（B1,C1:C3）是对( )共四个单元格求和 公式=SUM(B21,B31,B37,B41,B46,B50) 其中每个引用单元格都是SUM求和的,函数计算结果为56,显示却为0点开函数参数时,上面显示计算结果为56,公式单元格内却显示为0,单元格格式没有问题,请问还有没有 定语从句中that能做主语吗.比如 I believe that is the best. The acting is so convincing that it makes you believe that it is one of the best meals he has evertasted!这句话的句型?和句子结构 证明sinA-sinB=2cosA+B/2sinA-B/2补充另一问题 三角形正弦定理那节的题三角形ABC c边=6 b=9 A=45度 有几解 再问一个 （a^+b^）sin(A-B)=(a^-b^)sin(A+B),试判断三角形形状 到底是等腰或直角三角形还是等腰直 高一数学（在△abc中 c= π/ 2 则sina sinb的最大值）在△abc中 c= π/ 2 则sina sinb的最大值 —————— 【高一数学求指导】设π/2>a>b>0 求证:a-b>sina-sinb希望详解,感激不尽 请问：千金二萜醇的薄层分析条件是什么?就是如何在硅胶色谱板上把它鉴别出来. 硅胶薄层色谱,跑板后呈现分层现象是什么原因?我用的是买的硅胶板,跑板后呈现分层现象,最上面一层是一片黄色,接着是很乱的一片灰色,在接下来又是另一层,而我要的主斑点几乎和原点挨着 陆游《卜算子咏梅》的意思是什么? 求sina……2cosa的最大值……是平方 不求导行不？ sina-2cosa最大值sina-2cosa取最大值时 cosa=多少 sina-√2cosa最大值如何计算如题 英语翻译i don't mind it i don't mind at all it's like you're the swing set and i'm the kid that falls it's like the way we fight the times i cry we come to blows and every night the passion's there so it's gotta be right,right?no i don't believe You Don'T Believe 歌词 在酒吧听到一首慢摇歌曲.,女生唱的,歌词中好像有 why you don't believe me.有人知道嘛?不是很快的那种,女生的声音不细.说错了.是 why don't u believe me Don't you believe me?回答Yes ,I do.表示什么? I don't believe you 歌曲心语这歌我很想明白想表达的是些什么?有共鸣的人请给我答案,万分感激.详细点好么.真的谢谢了.No I don't believe you ,when you said don't come around here no more ,I won't remind you ,you sa i always feel that i find someone and i do believe that you are the one sina^2+2sinc^2=2cosa,y=sina^2+sinc^2的最大和最小值 sina^2=-2cosa,求a我算了半天a=0但是不对啊, The thing that you can't get is always the best!请大家告诉下我这句话的意思. sinA=2-2cosA求sinA? I know the best things---that's you are always in my heart! sina=2cosa 3sina+2cosa who do not fall into that category are not as bad off as they tend to believe怎么翻译 All that glitters is not gold.和All things are difficult before they are easy. 纯净水和电解水哪种水好? 1.电解水时,不用纯水而用稀氢氧化钠溶液,是因为氢氧化钠溶液中含有较多的自由游动的离子 2.某同学把一个生鸡蛋分别放在食盐水和自来水里,根据鸡蛋浸液体里体积的大小来区分哪个对?为