22. 對定義域分別是Df.Dg的函數y=f, f 當x∈Df且x∈Dg 規(guī)定: 函數h 當x∈Df且xDg g(x) 當xDf且x∈Dg =-2x+3 ,x≥1; g(x)=x-2,x∈R,寫出函數h(x)的解析式; 中函數h(x)的最大值; , 其中α是常數,且α∈[0,π],請設計一個定義域為R的函數y=f(x),及一個α的值,使得h(x)=cos2x,并予以證明. 13 14 15 18 16 582.6元 17 ①②⑤ 查看更多

 

題目列表(包括答案和解析)

(本題滿分15分)已知直線與曲線相切

1)求b的值;

2)若方程上恰有兩個不等的實數根,求

①m的取值范圍;

②比較的大小

 

 

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((本題滿分15分)
某有獎銷售將商品的售價提高120元后允許顧客有3次抽獎的機會,每次抽獎的方法是在已經設置并打開了程序的電腦上按“Enter”鍵,電腦將隨機產生一個                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        1~6的整數數作為號碼,若該號碼是3的倍數則顧客獲獎,每次中獎的獎金為100元,運用所學的知識說明這樣的活動對商家是否有利。

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(本題滿分15分)

已知函數

(1)求的單調區(qū)間;

(2)設,若上不單調且僅在處取得最大值,求的取值范圍.

 

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(本題滿分15分)已知拋物線),焦點為,直線交拋物線、兩點,是線段的中點,

  過軸的垂線交拋物線于點,

  (1)若拋物線上有一點到焦點的距離為,求此時的值;

  (2)是否存在實數,使是以為直角頂點的直角三角形?若存在,求出的值;若不存在,說明理由。

 

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(本題滿分15分)設函數

(Ⅰ)若函數上單調遞增,在上單調遞減,求實數的最大值;

(Ⅱ)若對任意的都成立,求實數的取值范圍.

注:為自然對數的底數.

 

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