下面的圖形是天氣預(yù)報(bào)的圖標(biāo),其中既是軸對稱圖形又是中心對稱圖形的是( 。

A.

B.

C.

D.

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已知二次函數(shù)的圖象經(jīng)過點(diǎn)A(-3,0),B(3,4).求這個(gè)二次函數(shù)的解析式.

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下列是我國四大銀行的商標(biāo),其中不是軸對稱圖形的是(    ).

      

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如圖,已知點(diǎn)D、E在BC上,AB=AC,AD=AE。求證:BD=CE。

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已知:等邊△ABC

(1)如圖1,P為等邊△ABC外一點(diǎn),且∠BPC=120°.試猜想線段BP、PC、AP之間的數(shù)量關(guān)系,并證明你的猜想;
(2)如圖2,P為等邊△ABC內(nèi)一點(diǎn),且∠APD=120°.求證:PA+PD+PC>BD.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 


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當(dāng)            時(shí),分式值為0.

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分解因式:

-4a2x+12ax-9x     

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的絕對值是      ,

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不等式組的正整數(shù)解有( 。﹤(gè).

A.4    B. 3         C. 2         D.1

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