如图.在△ABC中.AB＝5.BC＝3.AC＝4.动点E在AC边上.EF∥AB交BC于点F．[小题1]当△ECF的面积与四边形EABF的面积相等时.求CE的长[小题2]当△ECF的周长与四边形EABF——青夏教育精英家教网——

如图，在△ABC中，AB＝5，BC＝3，AC＝4，动点E（与点A、C不重合）在AC边上，EF∥AB交BC于点F．

【小题1】当△ECF的面积与四边形EABF的面积相等时，求CE的长
【小题2】当△ECF的周长与四边形EABF的周长相等时，求CE的长
【小题3】试问在AB上是否存在点P，使得△EFP为等腰直角三角形？若不存在，请简要说明理由；若存在，请求出EF的长．

的结果是（）

是二次根式，那么

应满足的条件是（）

Once a man and his wife worked for a businessman．There was a big box in the businessman’s living room．The businessman pointed at the box and said，“There’s only one thing you 1   do．Don’t open the box．”After  2    this，he left the living room．
The woman said to her husband，“There must be  3   in the box．Let’s open it，shall we?” Her husband said ___4___ to her．
But the woman didn’t give up her idea．One day，she decided to ___5___ what was      __6   it．Her husband didn’t stop her this time．She opened the box and looked inside．She found nothing in the box and then tried hard to close it,    7   she failed．
That evening the businessman came home and found the box was   8  ．He was very __9___ and asked the woman and her husband to leave his home．
“But there is nothing in the box，”the woman said．“We   10    anything at all．”The businessman shouted at them，“The box is not important．I cannot believe you．That’s important!”
【小题1】A．needn’t     B．wouldn’t   C．mustn’t       D don’t have to
【小题2】A．saying     B．said        C．says         D to say
【小题3】A．expensive something
B．something expensive
C．nothing expensive
D expensive anything
【小题4】A．yes        B．nothing     C．no           D hello
【小题5】A．look for    B．clean up    C．find out     D get over
【小题6】A．near       B．under       C．in           D on
【小题7】A．though     B．or         C．unless       D but
【小题8】A．closed     B．empty       C．open         D full
【小题9】A．happy      B．angry       C．stressed out D worried
【小题10】A．didn’t take B．won’t take C．haven’t taken D aren’t taking

列图形中，既是轴对称图形，又是中心对称图形的是（）
A．等边三角形 B．矩形
C．正五边形 D．等腰梯形

在半径为18的圆中，120°的圆心角所对的弧长是（）

一个口袋内装有大小和形状相同的一个白球和两个红球，“从中任取一球，得到白球”这个事件是( )

A．必然事件

B．随机事件

C．不可能事件

D．不能确定

彩云中学九年级（一）班同学举行“奥运在我心中”演讲比赛．第三小组的六名同学成绩如下（单位：分）：

．
则这组数据的众数是（）

已知⊙O的半径为8, 圆心O到直线l的距离是6, 则直线l与⊙O的位置关系是　

的解是　　．

0 110640 110648 110654 110658 110664 110666 110670 110676 110678 110684 110690 110694 110696 110700 110706 110708 110714 110718 110720 110724 110726 110730 110732 110734 110735 110736 110738 110739 110740 110742 110744 110748 110750 110754 110756 110760 110766 110768 110774 110778 110780 110784 110790 110796 110798 110804 110808 110810 110816 110820 110826 110834 366461