用140/x一-120/1.2X=4

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26厘米乘12厘米是什么尺寸的纸 sec立方求积分(要详细过程)我想知道这个积分是怎么算出来的?/> 12平米有多大 去户外静听虫鸣鸟叫,辨别这些声音,并用一段话形象的描写出来.(用发言稿的形式) 一项工程,甲队独做9天可以完成,乙队独做12天可以完成,甲,乙合作,每天完成这项工程的几分之几?甲乙合作,几天可以完成任务? sec(x)的积分是多少?怎么求的?3Q Although there is not a lot of traffic,on average,one vehicle comes off the road every two weeks. y=sec³x怎么积分? Theer are three seasons in a year.中文意思 比4吨少5分之1的是()吨 three-year-old triplet 的意思 ( )比1/5吨少1/4吨 Three year pain 还有esven year itch 1/5吨比( )吨少1/4 we have so many things for dinner的同义句 1/5吨比1/4吨少()%;1/4吨比1/5吨多()% risks can only be insured against if they can be estimated这句话里的against怎么译,为什么要用? 在地图上把海洋深度相等的个点连成线叫做? 英语翻译They had forsaken (抛弃) the familiar medium; they had trusted themselves to the mercies of those who had no reason to care for them; knowing their protector's indifference,they had lived for long in fear; and they were aware that they 去户外静听虫鸣鸟啼,辨别这些声音,并用一段话形象地描写出来300字以上 积分sec t=? SEC^3的积分,如图,红框所标示的步骤应该是用了分部积分法,可是怎么看不懂呢? 求该分步积分的推导过程 求该步分步积分的推导过程 绿色蝈蝈的研讨与练习答案去户外静听虫鸣鸟啼,辨别这些声音,并用一段话形象地描 去户外静听虫鸣鸟啼,辨别这些声音,并用形象地描写出来.600字啊快 要来不及了 请帮忙判断以下关于物理说法的对错,并说说为什么.1.第一宇宙速度是卫星绕天体表面运行时的速度2.任何天体的第一宇宙速度的数值都是7.9km/s Planning so far ahead no sense—so many things will have changed by nso far ahead是定语,修饰planning吗? this river is twice longer than that one据说外国人不理解比据说外国人不理解中国的比•大几倍·只有是几倍的说法.这条河是那条河的三倍到底怎么用比较级说.我看网上也很乱.有权威的吗? 关于电场中的等势面,下列说法正确的有 A,等势面不一定和电场垂直 B,沿电场线电势一定升高C,在同一等势面上两点间移动电荷,电场力做功为0 D,处于静电平衡状态的导体是等势体,表面是一个 In one three-year period alone,he wrote music for nineteen shows.怎么翻译啊? 我要短一点的记叙文,倒叙,顺叙,插叙都行 最好是描写父爱的.实在没有的话也没关系 .500 字以内的 篇数越多越好