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利用换元法解方程x的平方+1/x的平方-3（x+1/x）=2 请教高一函数与几何结合题把半径为10厘米的半圆形铁皮锯成一个等腰梯形,梯形下底AB的长等于圆的直径,上底CD的端点在圆周上.设等腰梯形ABCD周长为y厘米,腰长为x厘米,求出y与x的函数解析式 假如生命只剩3分钟我还能做什麽的文章.急用300字左右 如果你的生命还剩3天时间,你要怎么过?说的是如果 跪求七年级上学期语文寒假作业作文 求所有 浙江七年级寒假作业作文 to be done 和 done 做定语时的区别 ---- the PLA,they were saved and sent to the saety in floods. 宁外初一到初二所有化学方程式 being done能不能做定语? 过去分词作定语其否定式是not done还是not being don例题：Any application form____can not be accepted by the company.A not filledB not being filledC not having been filled应该选哪一个? 3x²－2X＝－14 x＝?x等于几方程右边是-14 求他taylor swift Begin Again的英文歌词!不要中文,只是英文.谢谢 begin Grace ( ) of being a pianist when she was at the age of 6 Mike worked in the same office and they were friendly to each other.They often took their holidays Mike and Dick work in the same office.个人觉得这里用at比用in好一点吧.哪位高手能给我介绍个方法对于”在“这个英文什么时候用at,啥时用in,啥时用on. Sam and Mike are in____ _____填什么?A.Ciassc One B.Grade One C.Ciass Two 选A还是B或C? There are some offiices in frout of the gym .改为一般疑问句 给全部的追加100分 He would like to go__(shop) He would like go to the supermarket.改错 卧薪尝胆用英语怎么说 He can't like to go to the hospital.它的同义句＿＿＿＿＿ 自强的英语怎么说 英文填词A：What is Mike( ) B:Is he catching the butterfly?A:No,he's( ) photos.B:How( ) he spend his weekends?A:He often( ) photos,sometimes he goes climbing.酷爱! he is _________that i'd like to introduce him to you.A so noble a person B such a noble person请问B错误在哪里呢? 英语怎么说：吃撑了 There__are__(be)different kinds of food in the shop.为什么用“are”Milk and Coke are my favourite drinks为什么用are “你吃撑了吗?”用英语怎么说?是“撑”而不是“饱”， 横撑用英语怎么说?H/D braces 是横斜撑的意思diagonal brace 是斜撑的意思那这个H 代表什么单词呢?横撑应该怎么说呢? 忙之心亡.死了的心,还能干什么呢?假如有一天将要离开这个世界, 希望最后的归宿是开心的离开.