如圖,面積為12cm2的△ABC沿BC方向平移至△DEF位置,平移的距離是邊BC長(zhǎng)的兩倍,則圖中的四邊形ACED的面積是______cm2

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科目:初中數(shù)學(xué) 來源: 題型:


已知拋物線的頂點(diǎn)為點(diǎn)C

(1)求證:不論m為何實(shí)數(shù),該拋物線與x軸總有兩個(gè)不同的交點(diǎn);

(2)若拋物線的對(duì)稱軸為直線,求m的值和C點(diǎn)坐標(biāo);

(3)如圖,直線與(2)中的拋物線交于A、B兩點(diǎn),并與它的對(duì)稱軸交于點(diǎn)D.直線交直線AB于點(diǎn)M,交拋物線于點(diǎn)N.求當(dāng)k為何值時(shí),以C,D,M,N為頂點(diǎn)的四邊形是平行四邊形.



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在△ABC中,已知∠A=∠B=∠C,則三角形是(    )

A、銳角三角形  B、直角三角形  C、鈍角三角形  D、形狀無法確定

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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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在△ABC中,∠ACB=90° ,點(diǎn)O為△ABC的三條角平分線的交點(diǎn),OD⊥BC,OE⊥AC,OF⊥AB,點(diǎn)D,E,F(xiàn)分別為垂足,且AB=10,BC=8,則點(diǎn)O到三邊AB,AC,BC的距離分別是(   )

A.2,2,2    B.3,3,3   C.4,4,4   D.2,3,5

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分解因式:

-4a2x+12ax-9x     

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將兩塊全等的三角板如圖①擺放,其中∠A1CB1=∠ACB=90°,∠A1=∠A=30°.
(1)將圖①中的△A1B1C順時(shí)針旋轉(zhuǎn)45°得圖②,點(diǎn)P1是A1C與AB的交點(diǎn),點(diǎn)Q是A1B1與BC的交點(diǎn),求證:CP1=CQ;
(2)在圖②中,若AP1=2,則CQ等于多少?


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計(jì)算:

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在等腰直角三角形ABC中,,斜邊AB上的中線與一腰的垂直平分線相交于點(diǎn)E,則點(diǎn)E到三角形三個(gè)頂點(diǎn)的距離是   ___________      .

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