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求证sec x=1+x^2+(2/3)x^4+. sec3 x 的积分怎么求?老师要求把sec3 x 拆成sec x 和sec2 x.（3是3次方）求完整步骤. 既不解方程,也不画图,你将如何判断方程组解的情况打个比方说3x+4y=82x-y=7应该怎么解? 既不解方程组也不画图像,判断方程组解的情况①2x+y=4,2x-3y=12②3x-4y=5,6x-8y=12③2x+3y=5,6y=10-4x就说清每个方程组有解还是无解还是有无数组解 既不解方程,也不画图,你将如何判断下列方程组解的情况?1.3x+4y,2x-y=7; 既不解方程,也不画图,你将如何判断下列方程组解的情况（是初二上的题目,别用初二上以后的知识来解）{3x+4y=8,2x-y=7;{y=2x-5,4x-2y=10;{3x-4y=2,6x=8y+6;{x=2,x+y=7 既不解方程,也不画图,你将如何判断下列方程组解的情况?3x+4y,2x-y=7; As soon as he __the post office,he put the letter into the post officeA reached B got C arrived D went to 说下原因. 角边角和角角边的区别是什么? 英语 what effects can newspapers have on society 中间的have on 角的比较 Society's people have been now realistic,what people scientists have been resreaching what effect smoking has on us为什么不能用 what effects?还有可数名词不单独出现,除非有物主代词修饰 还有别的情况? What is his name who sit under that tree>? Whenever you are Criticized,Always remember this.No stones are thrown on a Fruitless Tree 求托福口语第一题：what is the most interesting class you have ever taken?explain the aspects of the class that made it interesting.Include details and examples in your explanation.我实在想不出说什么,45秒内答完. step out into the road You shouldn't have taken pictures before the carved stones.怎么译? Have you taken your holiday yet?这句话怎么翻译? Go along this road and you can see the pose office the roadA：at the end B:in the end C:in the end of D:at the end of 1000分之324,可以化成最简分数吗?如果可以请化出来. have been + n.是什么用法,（thanks a lot)是have been + 名词 的用法，不是+过去分词，也不是现在分词的。 have been to ,have been in和 have gone to区别是什么? 文献检索作业.对于高手来说很简单的.所有分都给你要求：1.拟定课题,（最好选择其他课程中要求以论文方式考核的；无此类课程的同学可自拟题目,但最好是人文社科类选题）,并在课题分析 文献检索作业教学改革的管理意义与实现途径从课题字面析出的检索词有?从内涵扩展析出的检索词有? 减数是差的7分之3,被减数与减数的最简整数比是多少? 减数是差的7分之3,被减数与减数的最简整数比是多少?不要方程 减数是被减数的七分之三差是减数的多少 复合函数的定义中“g（x）的值域与f（u）的定义域的交集非空”什么意思啊,最好有多个例子便于理解,例如在空集的情况下复合函数的表达式 函数g与函数f构成复合函数f.g的条件是,函数g的值域Rg必须含在函数f的定义域Df内还是Rf与Df有交集? 最小的四位数是（ ）,最大的五位数是（ ）. Idiot,if only you had made this decision