越南老街省农村状况

已知a-(3,4) ,b=(-6,-8),求cos 已知a=（3,4）,b=（-6,-8）,求cos（a乘以b） 深夜,那盏灯中姐姐是怎样的一个人 设x1x2是关于x的方程x2+4kx+3=0两个实数根,y1y2是关于y的方程y2-k2+p=0的两个实数根若x1-y1=2,x2-y2=21.求k,p的值2.若以点（k,p)为顶点且对称轴平行于y轴的抛物线经过点（0,-2）,求此抛物线的解析式 深夜,那盏灯 快~~~~~ 我很急~~~ 《深夜,那一盏灯》那一年的春天,我被一场飞来车祸轧断了双腿,造成粉碎性骨折.医生说,治愈的希望很渺茫.整天除了瞪着天花板挨着以泪洗面的日子,还能做什么呢? 在小学教音乐课的姐 cos 三分之八派 they believed that their conclusion was right,____?反义疑问 一种商品进价为80元,若获利25%,则此商品的售价为? In Chinese mythology, they believed that the world at one time had ten suns that .In Chinese mythology, they believed that the world at one time had ten suns that were caused by 10 crows. The effect was devastating to the crops and nature, so they se 两件商品,一件按进价25%销售,另一件按进价降低20%销售,结果售价相同,问商家是盈利还是亏损了?急,快来帮忙啊! 一种商品进价25元卖30元,请问利润是多少我问的是利润是百分之多少 They believed that the toleration of another religion different from their own. 宾语从句的谓语是? 34.They believed that by using computers the production of their factory ________.A.will greatly in34.They believed that by using computers the production of their factory ________.A.will greatly increaseB.would greatly increaseC.would be increased g You must do everthing you can help them 改错 -You_____wash the clothes yourself.-Fine.I well ask someone to help me.A.must B.mustn notC.have to D.do not have to 应该选什么. They are busy p______ using computers now By using computers as an example,the author wants to prove that products of the latestdesign fold the market. 请用【交点式】求二次函数解析式.交点式! 用交点式求二次函数的解析式 5.4万精确到了什么位?有哪几个有效数字? 4.50万精确到哪一位,各有几个有效数字 长方形怎么画线,可以分成两个钝角三角形和两个锐角三角形 i want to talk to mother两个to各起什么作用? My mother never stops __(talk) to me怎么写? 二次函数怎样将一般式变为交点式,又怎样将一般式变为顶点式.速求 二次函数顶点式是不是只需两点,交点式与一般式是要三点对吧 phones must be kept off _____ the talk you must be something to talk You must be p____ when you talk to a young child 他像喝醉了酒一样,整个世界对他来讲好像已经消失了.这句话用了修辞手法吗? 他像喝醉了酒一样,整个世界对他来讲好像己经消失了.（用了什么修辞手法?）