等差数列求和公式推导

以前我比较懦弱 记得有一次几个小混混拿着刀殴打我 后来不知道怎么了 突然一下爆发了 就是心里什么都不怕 几下就把那个混混头目给打的全身都是血 那个时候我才14岁 那个混混起码二十 I shall answer your question after class 中的shall answer 和after class分别是什么句子成分 英语选择题:Answer my question,____? A.shall we B.won't you C.don't you英语选择题：Answer my question,____? A.shall we B.won't you C.don't you 翻译Which hair brand do you like best 英语高手来(不用太厉害的)!最好在9:00之前写完.结合folling的对句子,使用who,that或which1:The road was destroyed in the earthquake.It has now been built stronger.2:The people were in danger.The soldiers have saved them.3:The wai I usually go to school (?)-(?)我通常七点去学校 两格 I usually go to school at 7:00对画线部分提问画线部分：at 7:00 包头第二热电厂地址和电话? 包头哪个热电厂好 帮翻译 包头第二热电厂2×200MW机组扩建工程安全性评价 inexpensive和cheap 区别比如：（）but useful.A.cheap B.inexpensive答案上是B.inexpensive 但为什么不能用cheap inexpensive 和cheap的区别 cheap cheaper 区别 I need her like fish need the water to breathe 中国内蒙古包头市昆都仑区友谊16街坊16栋15号翻译成英文 在晏殊的描写落花的诗句中,那一句与龚自珍的“落红不是无情物”表达的情感相反 英文歌里面有句say yeah,yes yes ,say yeah,yes yes ,i‘m driving slowly……in my mind ,in my mind是男的唱的 生活中得英语字母的简写 we must keep quiet when others answer question 改为祈使句i think lily has to stay at home at night 改为否定句 every four seconds为什么用的是every 《望天门山》诗中描绘了巍巍的什么,滔滔的什么,还有什么真是太壮观了 six another 和six other 或者那个是错的. Every day is another day. where （） your father come from （）内填did 还是does 有什么关于“涛”字或谐音的成语呢,褒义词,越多越好 Lin runs the fastest in his class的同义句Lin runs the faster than____ _____ in his classLin runs the faster than______ ______ ______in his classLin runs the faster than______ ______ ______ _______ in his class 求角a的度数要过程 怎么才能找回自己现在自己似乎没了方向,对自己特别的不自信.老感觉很多东西都离自己而去了.老觉得自己身上都是缺点.而且老觉得别人都不喜欢自己.可是以前的我特别开朗特别能交朋友. 怎样才能让我找回自己?如题 专注于自己的学业,放弃校园早恋,看破世间红尘.昨夜西风凋碧树,独上高楼,望尽天涯路.衣带渐宽终不悔,为伊消得人憔悴.众里寻他千百度,蓦然回首,那人正在,灯火 专注于自己的学业,放弃校园早恋,看破世间红尘.昨夜西风凋碧树,独上高楼,望尽天涯路.衣带渐宽终不悔,为伊消得人憔悴.众里寻他千百度,蓦然回首,那人正在,灯火阑珊处.-----后三句选自王国 求角A和角B的度数 特头（英语单词的谐音）,这个单词怎么拼.