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等边三角形三个角分别是什么度 过x轴上动点A(a,0)引抛物线y=x^2+1的两条切线过x轴上动点A（a,0）引抛物线y=x2+1的两条切线AP AQ,P Q为切点,设切线AP,AQ的斜率分别为k1,k2 (1)求证：k1k2=-4（2）求证：直线PQ恒过定点,并求出此点坐标 different和the different的区别 different 和 the different 有何区别the twins are in class补一个:They go to a different school 又怎么解释 英语翻译鸠江区“方特杯”迎五一文化旅游活动 除了新东方和派特森,长春哪里有性价比高的精品小班口语寒假集训营? My uncle often plays the piano in his l____time 过点p(-1,-6)的直线l与抛物线y^2=4x交与A、B两点,若|AP|=|BP|.求直线l的斜率 已知点A在抛物线y^2=4x上,过点A作圆C:(x-1)^2+y^2=1的直线AP,AQ交y轴于M,N.P,Q是切点.1.若A（4,4）求PQ直线方程2.若向量AM乘向量AN=-2,求点A坐标 如何证明等边三角形三个内角为60度 等边三角形三个内角的度数都是（）度. He often plays soccer and listen加不加S?to music. 帮我该写动词的第3人称单数的形式有这几个：welcone meet spell have look like think help find give动词的第3人称单数的形式怎样写?>..帮 THINK YOU VERY MUCH! 三人称单数的动词正在进行时动词原形要变吗用中文回答 spare the first 3pedestrians 什么意思 求英文歌 "Never in my widest dreams could I imagine these people are living in such poor conditions." spare the 1.Did you go to the bookshop yesterday?2.Are koalas rare in the world?3.Will yoi watch TV after school?4.What did you do last night 5.Did Tom go swimming last sunday?6.When was kate born?A.I watched TV B.Yes,he did C.She was born in May.D.NO,I didn't 谁有一些好听的英文歌 一节关于团结心理活动课的作文急! 推荐几首好听的英文歌 meet see watch 的区别举例 学校作息时间表在不同季节往往会根据当地白昼时间的长短做相应调整.下列节日中,北京市白昼时间最短的是：A.元旦节B.教师节C.国庆节D.国际儿童节 什么? 与中山站相比,长城站所在地 A白昼时间长 B自转速度慢 C自转周期长 D正午太阳高度大选什么? if you want some more cake . please say so. 里面so什么意思? 2：but his doctor refused to do so. 跨国婚姻利大于弊英语 已知点E(m,n)为抛物线y^2=2px(p>0)内一定点,过E作斜率分别为k1,k2的两条直线交抛物线于A,B,C,D,且M,N分别是线段AB,CD的中点.1）n=0 k1*k2=-1求三角形EMN的面积最小值.2）若k1+k2=λ（λ≠0,λ为常数）,证明 pop love 2012里面,I got sex drive,push push push,push to start那个是什么歌?就是lights前面那首.还有后面NICKI MINAJ和唱的you could be my boy,you could be my boy toy那首是什么. Were ____ you go yesterday?We____to Mr White's house.____is Mr White?He is our English tescher.He is ____London. 我从浴室出来的时候,电话响了.用英语翻译