设F1，F2为双曲线C：x2a2y2b2=1（a＞0，b＞0）的左、右焦点，过坐标原点O的直线与双曲

一个小球从塔顶做自由落体运动,最后2s内落下的位移为60m,求塔高 被褥消毒证明怎么写 便的多音字（两个） 定的多音字是什么（两个） then again的意思~ but then again their are other things you can do. 港行iPhone5后背那些文字是不是英文的还是中文的 In the same circle forever.A,B,Then A again,B again. but then I'm shoved forward again,tipped off balance,and I' m underwater once more 设y=e平方减lncosx,求dy.求全过程 设y等于X的平方加五减xe的x方,求dy和y` y=lncosx,求dy/dx;f'(x)=3x平方,且f(0)=1,则f(x)= 鸡妈鸭仔观后感,或《走出院子的母鸡》读后感急急急急急急急急急急急! 6x=18乘9分之1 昙花一现的故事 淘宝iphone5美版或者港版的系统是不是分别是英文繁体的? iphone5美版 全英文美版求越狱 meet u again in the hospital,but after four years ,u have changed maybe not the same girl ,lovely 设一个有理数为a,设一个无理数为x,求：a+x＝无理数 After the dicussion, we_______meet again the follewing Monday Soon after he left the hospital,his lung cancer ____ up again.A .caredB .staredC .flaredD .fared Maybe if I___sicence ,and not literature then ,I would be give you more help.A.studied B.would study C.had study D.was studying四个选哪个,考的是哪个语法点,c.had studied 标准对数视力4.8是几度 maybe if I stdied science,and not literature four years ago I would be able to give more help.单句改错 science then什么意思 Then maybe yo maybe I'll go back to the daysmaybe yo maybe 昙花一现的现是指什么时候? 地球是白天长还是晚上长 "昙花一现”是指什么时间? “昙花一现” 这一现的时间有多长时间? 已知函数f（X）=Asin（ωx+φ）（其中A＞0,ω＞0,0＜φ＜二分之派）的图像与x轴的交点中,相邻两个交...已知函数f（X）=Asin（ωx+φ）（其中A＞0,ω＞0,0＜φ＜二分之派）的图像与x轴的交点中,相邻 昙花一现的现在哪个时间?准确点啊