题目内容


下面的图形是天气预报的图标，其中既是轴对称图形又是中心对称图形的是（　　）

A．

B．

C．

D．

网


A 

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相关题目

已知二次函数的图象经过点A(－3，0），B(3，4)．求这个二次函数的解析式．

下列是我国四大银行的商标，其中不是轴对称图形的是（    ）．

      

A、         B、          C、           D、

如图，已知点D、E在BC上，AB=AC，AD=AE。求证：BD=CE。

已知：等边△ABC

（1）如图1，P为等边△ABC外一点，且∠BPC=120°．试猜想线段BP、PC、AP之间的数量关系，并证明你的猜想；
（2）如图2，P为等边△ABC内一点，且∠APD=120°．求证：PA+PD+PC＞BD．

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

当            时，分式值为0．

分解因式：

－4a2x+12ax－9x     

的绝对值是      ，

不等式组的正整数解有（　　）个.

A.4　　  B. 3         C.　2　　       D.1

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