3x+4x+5x=6x

世界著名的“罗基山脉”位于美国、墨西哥和哪个北美洲国家? 北美洲最高山峰是哪个? 英语课听不进去 went to l shenzhen plane by连词成句 什么是高铁砂 连词成句:by lily to hefei went plane Where+is+he/she+going+on+New+Year's+Day+and+how+will+he/she+go+there? 一方铁砂是多少吨 The world's farthest distance is not life and death, The mother is very happy () (see) her son again.Grace,don't go out in the () (snow) weather I love you forever,and i will give the love of world for ervy how happy the mother was___（ see） her lost son again.Sun yang has become more famous because of____(win)the gold medals.怎么填?正确的形式 氟离子可用什么试剂滴定 The mother worries about her son very much . (同义句) The mother her son very much . the mother 什么her son very happily 亲和能力最强的试剂是哪个 A氯离子 B溴离子 C碘离子 D氟离子 为什么 We will celebrate Halloween with three Chinese friends(改为一般疑问句) 如何判断椭圆标准方程 RT:1椭圆中为何凭 a^2 b^2就可以判断焦点在哪 2求椭圆与双曲线的方程,若只求出x轴上的方程,y轴怎么求第2个问题,是只要把a^2 b^2调换位置就能求了嘛?我做的一些题目不是这样的.3：求双曲线渐 淑女是怎样的?3Q 已知在Rt△ABC中,∠C=90°,∠A、∠B、∠C所对的边分别为a,b,c是判别关于x的方程aa（x²-1）-2bx+c（x²+1）=0的根的情况 淑女是怎样的?应该注意哪些?拜托各位了 3Q could,would...there are many things we couldn`t predict.这里的could代表什么,为什么不用“can” cherish what you have now and things would be better .这里的would 又代表什么?为什么不用" will " 淑女是什么样子的?3Q3 这里是would 还是could ?I'd appreciate it if it could be arranged.如果能安排好,我会很感激.'d 这里 = would / could ? 简单分析下. 谢谢 真正的淑女是什么样的?3Q这世界上还有淑女吗? 这个应该是would 还是 could 呢?I'd appreciate it if it could be arranged.如果能安排好,我会很感激.'d 这里 = would / could ? 简单分析下. 谢谢 would和couldcould you please do me a favor能换成would you please do me a favor吗 Her mother seems unhappy with her gardes Her mother seems ___ ___ with her gardes No matter how determined the will of the heart是什么意思 if i could ``then i would```跪求中文歌词So lately,been wondering Who will be there to take my place When I'm gone you'll need love to light the shadows on your face If a greater wave shall fall and fall upon us all Then between the sand and sto 幻灯片中判断对错不好意思，刚才刷新后提交之前问题补充没了，现补充说明：公司开年会做游戏，幻灯片中插入员工孩子照片猜对错，放一张换灯片回答后显示对错，勾或叉，怎么在幻灯