东北二王的哥哥

如图所示,已知 双曲线y=k/x 经过梯形ABOC的上底边,且A（-7,2）,AO交BC于点D,S△ABD=3,S△BOD=9,则k=____. when ()it ()?(arrive) half an hour ago2.how many times ()the doctor ()(be)to america When ——it ——（leave）?——Half an hour ago. A:When________it________?(arrive)B:Half an hour ago.急! 有趣的一件事 用英语描述一件有趣的事,越短越好! some数学题!11.一套衣服打七折后是600元,这套衣服原价多少元?12.一批小麦的出粉率是80%,要磨出200千15克的面粉需要多少千克小麦?13.一本故事书,看了30页后还剩60%,还剩多少页没有看?14.用30克盐 先说husband,MM会说u(you),再说wife,MM会说I"""是什么意思啊 Husband, wife you would like to 什么意思?`.翻译后还是看不出... 谁知道哦? 推荐几本能查单词,有语法、练习题的书籍（辞典）? “———”“————————”写出了苏黄的友好关系和互相切磋,谈论的神情 里面填什么,应该是《核舟记》里面的 tall,is,he,how!如何变成一个感叹句 英语词性活用填空 同义句转换:I want to improve my Maths=I want to ________ my Maths ________ Sexual Intercourse是什么意思 本句语法不规范,帮我改一下some famous scientists who they take much times on their own experiments so as to cause their successful results, because some experiments need a lot of texts to point out their precision 谁能帮我看一下这个句子哪里语法不规范吗?顺便帮改下 What's more terrible is that the patients who give themselves treatment by using the computers instead of seeing a doctor sometimes might be misdiagnosed and their illness will 修改语法不规范We can't let ourselves distract us from the job must be down because of lacking self-control, nor can we let mobile phone's influence stop us from our task.这句好像语法不规范,如何修改? 看一下哪里语法不规范? 顺便帮改下With the rapid development of science and technology, many inventions, one of which is the disposable plastic bag, have been made to make our daily life convenient. I can speak a little english 哪个是情态动词.哪个是不定式.指出来 有你真好 作文 800字 英语翻译求求你们了 反复句式每段开头都要一样的一句话. 介词中的介词的宾语可以有宾补吗? Don't worry her.She can look after herself.哪一处错了 I always concerned about you with the way you know and the way you don't “i don‘t know the way ,do you?” 用间接引语怎么说 帮我看看这个句子语法哪里不规范?Although we all know "Failure is the mother of success",few people can really know what to do with failure. 为什么这一句不执行呢?语法是这样写的吗?谢谢你们的回答 好像还是不行 原来不是if判断的问题 是显示的标签的问题 这样写就可以显示了上级栏目 谢谢你们的认真回答! 婀娜的舞姿,是（ ）美,（ ）自然.怎么填括号内的关联词 求解这个基础解系为什么-4 1 10 0 00 0 0的基础解系为0 和11 0-1 4 基础解系 求救!从1 0 00 1 00 0 0 中怎么看出它的基础解系是 001 为什么从1 0 10 1 20 0 0中就可以看出基础解系是12-1 我知道1，2 的来源，但是1是怎么得到的···