函數(shù)的值域?yàn)?nbsp;                 .

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的二項(xiàng)展開(kāi)式中,所有二項(xiàng)式系數(shù)和為,則該展開(kāi)式中的常數(shù)項(xiàng)為         .

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設(shè)為拋物線的焦點(diǎn),為該拋物線上三點(diǎn),若,

的值為

A.               B.              C.              D.12

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函數(shù)的定義域是

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設(shè)雙曲線的兩條漸近線與直線分別交于兩點(diǎn),為該雙曲線的右焦點(diǎn).若, 則該雙曲線的離心率的取值范圍是

A.          B.C.        D.

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經(jīng)調(diào)查統(tǒng)計(jì),某種型號(hào)的汽車在勻速行駛中,每小時(shí)的耗油量(升)關(guān)于行駛速度

(千米/時(shí))的函數(shù)可表示為.已知甲、乙兩

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到乙地的耗油量記為(升).

(Ⅰ) 求函數(shù)的解析式;

(Ⅱ)討論函數(shù)的單調(diào)性,當(dāng)為多少時(shí),耗油量為最少?最少為多少升?

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由直線上的一點(diǎn)向圓引切線,則切線長(zhǎng)的最小值為(     )

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集合,,則

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在四棱錐E-ABCD中,底面ABCD是正方形,ACBD交于點(diǎn)OEC⊥底面ABCD,FBE的中點(diǎn).

(Ⅰ) 求證:DE∥平面ACF;

(Ⅱ)若AB=,在線段EO上是否存在點(diǎn)G,使CG⊥平面BDE?若存在,求出的值;若不存在,請(qǐng)說(shuō)明理由.

 


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