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求不定积分∫ 9x/(x^2+1)dx 求过点P（0,3）且和圆x∧2＋y∧2-4x-5=0相交所截得的弦长为2√5的直线l的方程. 15题,最好有过程, 解答题11.15如图：从椭圆上一点P向x轴作垂线,恰好通过椭圆的一个焦点,这时椭圆的长轴的端点A和短轴的端点B的连线平行于OP.求椭圆的离心率. 这几个字是什么,我看不懂 直线L与直线2x+2y+3=0垂直,若直线L被圆C: x^2+y^2-6y+1=0截得的弦长为4√2,则直线L的方程是_____详细过程,谢谢 图1为打点计时器打出的纸带,A、B之间的时间间隔 B、C之间的时间间隔.A、C之间时间间隔几秒C、F几秒 打点计时器我们能从纸带上直接得出时间间隔吗 用动词的正确时态填空：1.i ___(wait) for the bus at the bus stop when i ___(see)david.2.while i ___（paint）the kitchen,my sister ___(listen) to music.3.james___（meet）me when i ___ (do) the shopping with my mun.4.he ___（read）in be 用所给动词正确的时态填空1.look,some boy basketball on the playground.[play] 2you should＿inside when there is a typhoon.[stay] 3she＿her mother's telephone number.[not know] 4＿you＿your seat to older people when you are on the bus?[g 根据所给的动词正确时态填空拍的不好,将就将就 佛跳墙是什么东西? 佛跳墙是哪儿的菜,来历,为什么叫这个名字, 为什么说18世纪英国经验主义美学是走向主观美学的开始 打点计时器的频率为50HZ,打出6个点距离一次为2,5,9,14,20求打B点是速度多大.CE间的平均速度 用正确时态填空I saw many people ___(walk) along the lake.为什么? 用正确的时态填空1 As my father___(leave)the house,the postman___(arrive).2.Tom___(work)in the garden while i ___(sit) in the sun.3.As i ___(walk)down the street.i___(meet)Charlie.4.While he ___(read)the letter,he __(hear)a knock at the door.5 佛跳墙是什么?怎么做?谢谢! 突然想起来一道菜,请问大家佛跳墙是什么样的?用什么材料做的? 用所给动词的正确时态填空1.We ___________(not wait) if they _______(be) late.2.You _______(lose) weight if you ________(exercise) more.3.If a bee _______(find) food,it _______(dance).4.If you _______(put) wood into water,it _______(float). 我急需一篇作文；下面详细提问：我急需的作文,内容是：在这次综合性实践活动中,你一定有不少感受和收获吧?请你写下来,字数在三百个左右,要求不写错别字,语句通顺,内容具体.注释：在 可以理解为"支点"吗? 在规划建筑图纸中,有提到交通节点,有谁知道吗? 求一篇作文叫《我们读书人》………谢 交通结点是什么意思? 结点是什么意思 英语翻译Xu zheng won a prize for hie essay about the importance of English.Later,a reporter from the school magazine interviewed him.Use the reporter's notes to write an article about Xu Zheng.NotesInterview with Xu Zheng———————— 节点是什么意思 mary ()ping-pong on weekends. a.plays b.am play c.playing d.is plays 用正确的时态填空.急My watch doesn't work.I have to have it ______ (修理).If a problem _____ (使...担忧) you , go and talk to your teacher.To develop the ______ (有实践经验的) skills of using English is very important for the Engli 什么叫佛跳墙 分解因式：四分之x2+xy+y2 2、四分之x2+xy+y2 3、a2b2-4ab+4