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在△ABC中,a,b,c分别为角A,B,C所对的边,a,b,c成等差数列,且a=2c在△ABC中,a,b,c分别为角A,B,C所对的边,a,b,c成等差数列,且a=2c①求cosA②若△ABC面积为 3根号15/4,求b 介词to 和of的用法We sat down to dinner at six.句中的to 能换成 for with the implication that怎么翻译? 用分部积分法求第三题,第一题不用做 计算下图三重积分,请重点说明积分上下界,最好有图.积分我会,主要是搞不清界限,不知道这是一个怎样的几何体. there will be mind and rain in the evening. 帮我分析一下这个句子的句型If you need someone who cares for yousomeone who 这个someone 后面为什么要跟who 希望详解这个句子 thanks 找一首歌词有”i love you“”in my life“的英文情歌求大神帮助 为什么不及物动词后要接宾语时都要加一个介词哪?《go to school不能说成go school》谢谢回答 i'd like to go some scenic sites.这里go是不及物动词跟宾语怎么没加to? 英语翻译如题 this sunday I'll go swimming with_ Now many parents () their children () different classes to learn on weekends.A.send,for B.make,to C.send,to D.make,for把理由也讲讲吧! their homes are not far from the school.far The Bridge Street is not far from the school...同义句 emma什么意思 爱玛48v12AH20AH是什么意思 matter of怎么读matter of怎么连读 把音标也给写出来 cycles of matter是什么 梁上君子怎么造句 VB编程（用循环）输出下列图形 A BBB CCCCC DDDDDDD VB循环编程怎么弄啊A B C Daa Jack I am is aa,you is bb,cc is pig too...bb Mike you are aa,I am bb,pig is cc too...cc Yao she is aa,you is bb,cc is pig too.......要求把C列中的单元格里用公式将 aa bb cc.替换成 B列中的相对应 过去进行时He________(walk) home when the rain __________(begin).为什么答案是was walking和began而不用was beginning呢? 什么是“过去进行时”?什么是过去进行时?过去进行时分为哪几种时态?如何使用过去进行时? 过去进行时结构 过去进行时的结构大哥们,帮帮小弟吧! 一it was s___ of you to trust him.二she tried to一it was s___ of you to trust him.二she tried to h___ her feelings 三lt is a fine day.the sun is s___bright 首字母填空：1、It was s_____of her to trust you.You lied just now.1、It was s_____of her to trust you.You lied just now.2、I want to b_____ themagazine this year.3、He studies English well,because he has a good m_____.4、There are v_____ p The boy is very tired.He _____(need) a rest.时态填空相关语法? so cool怎么念出来 看过吗? 山市中孙公子禹年起什么作用,