纽约地铁是中国建的吗

And where will you go tomorrow什么意思 三个应用题给好评啊,坐等 (x-y)平方-14(x+y)+49 已知关于x的方程x2-6x+m2-3m-5=0的一个跟是-1,求m的值和另一个根 设关于x的方程x2-6x+k=0的两个根是m和n,且3m+2n=20,求k的值用伟达定理 分解因式（x+y）的2次方-14（x+y）+49 (x^2-2)^2-14(x^2-2)+49分解因式在线等 （x＋y）²－14（x＋y）+49 分解因式 49(x+y)^2-9(x-y)^2 因式分解 不会做的英语完形填空Do you have a plan for your future?Our country has its plan.It tells what China hopes to 1 in the next five years.The plan promises higher pay,better education andpollution by 2010.If the promises all come ture ,Chinese 英语完形填空不会做,怎么办 一道不会的英语完形填空这里是一道完形填空～Tome was twelve years old.He was not a very good boy,and he didn't like doing his homework.I_______,he liked to do other things in his free time.Often he didn't do the homework by himself 英语完形填空不会,On Christmas Eve a few days ago,an English couple,the Hardens,got a very special call.It was only a 20-second call but it was very (1).The Hardens'15-year-old daughter has gone (2) six months before.On Christmas Eve she rang 不等式√3 x-1＜√2 x的解集是 where引导的从句有哪些种? 14(x+y)²-9(x-y)²不是14，是14 But the most dramatic growth is underground,where the roots grow very strong.请问这个句子where 引导的是什么从句?As you begin to make deposits,you may see positive results immediately.as在这里 引导的是又什么从句? In places where there are rivers and lakes,like Hongshanhu and Kaishandao,students usually go to school by boat.这里where引导的是什么从句? 这个where引导的是什么从句 圆锥曲线 切线 好难过双曲线Y^2-3X^2=3的上支上一点P作双曲线的切线交渐近线分别于点A,B(1)求证向量OA*向量OB为定值（2）若向量OB=向量AM,求动点M的轨迹方程 求二次曲线的切线已知f(x+y)=f(x)+f(y)+2xy,f'(0)=1,求f'(1)的值为多少?(好象就是这样) 英语完形填空. 谁能帮我分析一下这个句中where引导的从句是什么从句?.这个从句是倒装了吗?我是问后面这个从句,不是问前面那部分.帮我分析一下这个句子的成分.Further up the Thames is the City of Westminster where a 脉冲什么意思? 脉冲的一些概念下面图中的pulse amplitude,pulse width,duty cycle 是多少还有v的平均值怎么求 脉冲波是什么（概念） 证明有限整环必定是域设（A,+,•）是一个有限整环,所以对于a,b,c∈A,且c≠0.若a≠b,则a•c≠b•c,再由运算的封闭性,就有A•c=A.对于乘法幺元1,由A•c=A,必有d∈A,使d•c=1,故d是c 有限域的特征性质 什么是有限论域?有限论域的概念及其意义是什么?有什么应用? 已知焦点在X轴上的椭圆离心率是√3/2,且点(0,3/2)距椭圆上点最远距离为√7,求椭圆的方程 2（X-Y)的平方-7（X-Y)的立方+3（y-x）的平方+（y-x）的立方.怎么化简? 求阴影部份面积,快,