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Mary and Peter were having a picnic near a river when Mary noticed something flying overhead. 1 , she shouted to her friends. That s a spaceship up there and it s going to 2 here. Frightened(吓
2019-07-23
如图，已知点A(-4，8)和点B(2，n)在抛物线上. (1) 求a的值及点B关于x轴对称点P的坐标，并在x轴上找一点Q，使得AQ QB最短，求出点Q的坐标; (2) 平移抛物线，记平移后点A的对应点为A ，点B的对应点为B ，点C(-2，0)和
2019-07-23
The generation gap(代沟)has become a 1 problem. I read a 2 about it in the newspaper. Some children have killed themselves after quarrels(争吵)with 3 . I think this is because they don t often have a
2019-07-23
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-23
2019-07-23
Washoe is a young chimpanzee(黑猩猩). She is no 1 chimpanzee, though. Scientists are doing research(研究) 2 her. They want to see how civilized(驯化) she can 3 . Already she can do many things as hum
2019-07-23
2019-07-23
Ballpoint pens have made life easier for millions of people. At one time 1 did not like their students to 2 with pen. Perhaps it was because pens can leak(漏) and it is 3 to spill(溢出) the ink. And
2019-07-23
如图，已知射线DE与x轴和y轴分别交于点D(3，0)和点E(0，4).动点C从点M(5，0)出发，以1个单位长度/秒的速度沿x轴向左作匀速运动，与此同时，动点P从点D出发，也以1个单位长度/秒的速度沿射线DE的方向作匀速运动.设运
2019-07-23
如图，一开口向上的抛物线与x轴交于A(m-2，0)，B(m 2，0)两点，记抛物线顶点为C，且AC BC. (1)若m为常数，求抛物线的解析式; (2)若m为小于0的常数，那么(1)中的抛物线经过怎么样的平移可以使顶点在坐标原点? (3)设
2019-07-23
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-23
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-23
A rich American went to Paris and bought a picture painted by a French artist. The American thought the picture to be very fine because he __1 a lot of money for it. When he came to his hotel he want
2019-07-23
如图，已知直线 与y轴交于点A，与x轴交于点D，抛物线 与直线交于A、E两点，与x轴交于B、C两点，且B点坐标为 (1，0)。 ⑴求该抛物线的解析式; ⑵动点P在轴上移动，当△PAE是直角三角形时，求点P的坐标P。 ⑶在抛物线
2019-07-23
Paris has a beautiful name, the City of 1 . Do you know 2 it means? Many beautiful buildings are lighted at 3 .The streets are very 4 .When you 5 in Paris, you must not turn 6 your headlights (汽车前
2019-07-23
2019-07-23
如图，已知抛物线与x交于A(-1，0)、E(3，0)两点，与y轴交于点B(0，3)。 (1) 求抛物线的解析式; (2) 设抛物线顶点为D，求四边形AEDB的面积; (3) △AOB与△DBE是否相似?如果相似，请给以证明;如果不相似，请说明理由
2019-07-23
善于学习数学的同学可能对数学学习已经形成习惯，进而有 数感 知道哪里需要补充学习、怎么有效学习。而如何形成这种习惯呢?下面七各方面可以着重实践练习。我们要锻炼学数学的能力，要改变单纯接受的学习方式，学会
2019-07-23
热点推荐： 英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-23
2019-07-23
The United States covers a large part of the North 1__ continent (洲), when this land first became a nation. After 2 its freedom (自由) from England, it has 13 states. Each of the states had a star o
2019-07-23
Do you know how to study better and make your study more effective(有效的) We all know that Chinese students usually study very hard for long 1 . This is very good, but it doesn t 2 a lot, for an eff
2019-07-23
如图，已知△ABC为直角三角形， ACB=90度，AC=BC,点A、C在x轴上，点B坐标为(3 ，m )(m
2019-07-23
如图9，已知抛物线的顶点为P，A为抛物线与y轴的交点，过A与y轴垂直的直线与抛物线的另一交点为B，与抛物线对称轴交于点O ，过点B和P的直线l交y轴于点C，连结O C，将△ACO 沿O C翻折后，点A落在点D的位置. (1) 求直
2019-07-23
已知：如图，在平面直角坐标系xOy中，矩形OABC的边OA在y轴的正半轴上，OC在x轴的正半轴上，OA=2，OC=3.过原点O作 AOC的平分线交AB于点D，连接DC，过点D作DE DC，交OA于点E. (1)求过点E、D、C的抛物线的解析式; (2)
2019-07-23
2019-07-23
The United States, Great Britain took the war on Iraq(伊拉克) in late March, 2003. 1 over twenty days American soldiers were in Baghdad, the 2 of Iraq. They ended the government(政府) of Saddam. 3 Ir
2019-07-23
Football is, I do think, the most favourite game in England: one has only to go to one of the important 1 to see this. Rich and poor, young and old, one can see them all there 2 for one side or the 3
2019-07-23
2019-07-23
如图11，抛物线 与x轴相交于A、B两点(点A在点B右侧)，过点A的直线交抛物线于另一点C，点C的坐标为(-2，6). (1)求a的值及直线AC的函数关系式; (2)P是线段AC上一动点，过点P作y轴的平行线，交抛物线于点M，交x轴于点N
2019-07-23
已知二次函数 的图象经过点A(1，0)，B(2，0)，C(0，2)，直线x=m(m
2019-07-23
英语词汇篇章式记忆汇总(20篇文章稿定)
2019-07-23
2019-07-23
Mr. North looks worried this week. He always 1 good habit. He gets up early in the 2 and does some exercises before breakfast. He thought himself 3 and didn t often go to see a doctor. But last Frida
2019-07-23
2019-07-23
Mr. Evans lives in a city. He was a math 1 three years ago. He taught well and his students 2 him. So he decided to work in the middle school all his life. But an accident 3 everything. One spring he
2019-07-23