8．設(shè)是展開式的中間項(xiàng).若在區(qū)間上恒成立.則實(shí)數(shù)的取值范圍是 【查看更多】

 

題目列表(包括答案和解析)

漢譯英。
1. 據(jù)報(bào)道，那種疾病已經(jīng)在全市擴(kuò)散開來。(spread) 
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2. 我們都知道他不誠實(shí)。(it's known to sb.)
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3. 說實(shí)話，他是個(gè)靠得住的人。(depend on) 
    _________________________________________________________________
4. 眾所周知，污染的空氣和水對我們的身體是有害的。(harmful)
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5. 他們在月球上的感覺和在地球上聽說的完全不一樣。(be different from)
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根據(jù)情景對話和內(nèi)容，從對話后所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，并在答題卡上將該選項(xiàng)涂黑。注意：若選E為答案是，則在答題卡上選涂A和B兩選；若選F為答案時(shí)，則在答題卡上選涂A和C兩項(xiàng)；若選G為答案時(shí)，則在答題卡上選涂A和D兩項(xiàng)。

---Hello. Can I speak to Wu Min, please?

---______6_______

---Hello, Wu Min. This is Wang Hong. Sorry to ring you so late in the evening, but I’ve only just got home.

---______7______ What can I do for you?

---I’d like to ask you about some stamps. Do you still have the cock year stamp? You had it when I last saw you.

---I’m afraid I don’t have it. I sold it last week.

---_____8_______

---I’m sorry. I didn’t know you wanted it. ____9______

---Yes, please. Thank you. It’s very kind of you.

---______10_______

---Thank you very much.

---Bye-bye.

A．Do you like collecting stamps so much?

B．That’s all right.

C．Sorry, Wu Min is out.

D．Do you want me to find one for you?

E.Oh, what a pity!

F.Yes, speaking.

G.OK, I’ll ring you if I have any news.

 

查看答案和解析>>

 

  根據(jù)情景對話和內(nèi)容，從對話后所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，并在答題卡上將該選項(xiàng)涂黑。注意：若選E為答案是，則在答題卡上選涂A和B兩選；若選F為答案時(shí)，則在答題卡上選涂A和C兩項(xiàng)；若選G為答案時(shí)，則在答題卡上選涂A和D兩項(xiàng)。

---Hello. Can I speak to Wu Min, please?

---_____1._______

---Hello, Wu Min. This is Wang Hong. Sorry to ring you so late in the evening, but I’ve only just got home.

---_____2.______ What can I do for you?

---I’d like to ask you about some stamps. Do you still have the cock year stamp? You had it when I last saw you.

---I’m afraid I don’t have it. I sold it last week.

---____3.______

---I’m sorry. I didn’t know you wanted it. __4._____

---Yes, please. Thank you. It’s very kind of you.

---____5.______

---Thank you very much.

---Bye-bye.

A.   Do you like collecting stamps so much

B.   That’s all right.

C.   Sorry, Wu Min is out.

D.   Do you want me to find one for you?

E.   Oh, what a pity!

F.   Yes, speaking.

G.   OK, I’ll ring you if I have any news.

 

查看答案和解析>>

 根據(jù)情景對話和內(nèi)容，從對話后所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，并在答題卡上將該選項(xiàng)涂黑。注意：若選E為答案是，則在答題卡上選涂A和B兩選；若選F為答案時(shí)，則在答題卡上選涂A和C兩項(xiàng)；若選G為答案時(shí)，則在答題卡上選涂A和D兩項(xiàng)。

---Hello. Can I speak to Wu Min, please?

---______6_______

---Hello, Wu Min. This is Wang Hong. Sorry to ring you so late in the evening, but I’ve only just got home.

---______7______ What can I do for you?

---I’d like to ask you about some stamps. Do you still have the cock year stamp? You had it when I last saw you.

---I’m afraid I don’t have it. I sold it last week.

---_____8_______

---I’m sorry. I didn’t know you wanted it. ____9______

---Yes, please. Thank you. It’s very kind of you.

---______10_______

---Thank you very much.

---Bye-bye.

A.Do you like collecting stamps so much?

B.That’s all right.

C.Sorry, Wu Min is out.

D.Do you want me to find one for you?

E.Oh, what a pity!

F.Yes, speaking.

G.OK, I’ll ring you if I have any news.

查看答案和解析>>

 根據(jù)情景對話和內(nèi)容，從對話后所給的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)，并在答題卡上將該選項(xiàng)涂黑。注意：若選E為答案是，則在答題卡上選涂A和B兩選；若選F為答案時(shí)，則在答題卡上選涂A和C兩項(xiàng)；若選G為答案時(shí)，則在答題卡上選涂A和D兩項(xiàng)。

---Hello. Can I speak to Wu Min, please?

---______6_______

---Hello, Wu Min. This is Wang Hong. Sorry to ring you so late in the evening, but I’ve only just got home.

---______7______ What can I do for you?

---I’d like to ask you about some stamps. Do you still have the cock year stamp? You had it when I last saw you.

---I’m afraid I don’t have it. I sold it last week.

---_____8_______

---I’m sorry. I didn’t know you wanted it. ____9______

---Yes, please. Thank you. It’s very kind of you.

---______10_______

---Thank you very much.

---Bye-bye.

A.Do you like collecting stamps so much?

B.That’s all right.

C.Sorry, Wu Min is out.

D.Do you want me to find one for you?

E.Oh, what a pity!

F.Yes, speaking.

G.OK, I’ll ring you if I have any news.

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1．解析：，故選A。

2．解析：∵

，

故選B。

3．解析：由，得，此時(shí)，所以，，故選C。

4．解析：顯然，若與共線，則與共線；若與共線，則，即，得，∴與共線，∴與共線是與共線的充要條件，故選C。

5．解析：設(shè)公差為，由題意得，；，解得或，故選C。

6．解析：∵雙曲線的右焦點(diǎn)到一條漸近線的距離等于焦距的，∴，又∵，∴，∴，∴雙曲線的離心率是。故選B.

7.解析：∵、為正實(shí)數(shù)，∴，∴；由均值不等式得恒成立，，故②不恒成立，又因?yàn)楹瘮?shù)在是增函數(shù)，∴，故恒成立的不等式是①③④。故選C.

8．解析：∵，∴在區(qū)間上恒成立，即在區(qū)間上恒成立，∴，故選D。

9．解析：∵

，此函數(shù)的最小值為，故選C。

10．解析：如圖，∵正三角形的邊長為，∴，∴，又∵，∴，故選D。

11．解析：∵在區(qū)間上是增函數(shù)且，∴其反函數(shù)在區(qū)間上是增函數(shù)，∴，故選A

12．解析：如圖，①當(dāng)或時(shí)，圓面被分成2塊，涂色方法有20種；②當(dāng)或時(shí)，圓面被分成3塊，涂色方法有60種；

③當(dāng)時(shí)，圓面被分成4塊，涂色方法有120種，所以m的取值范圍是，故選A。

13．解析：做出表示的平面區(qū)域如圖，當(dāng)直線經(jīng)過點(diǎn)時(shí)，取得最大值5。

學(xué)科網(wǎng)(Zxxk.Com)14.解析：∵，∴時(shí)，，又時(shí)，滿足上式，因此，，

∴。

學(xué)科網(wǎng)(Zxxk.Com)15．解析：設(shè)正四面體的棱長為，連，取的中點(diǎn)，連，∵為的中點(diǎn)，∴∥，∴或其補(bǔ)角為與所成角，∵，，∴，∴，又∵，∴，∴與所成角的余弦值為。

學(xué)科網(wǎng)(Zxxk.Com)16．解析：∵，∴，∵點(diǎn)為的準(zhǔn)線與軸的交點(diǎn)，由向量的加法法則及拋物線的對稱性可知，點(diǎn)為拋物線上關(guān)于軸對稱的兩點(diǎn)且做出圖形如右圖，其中為點(diǎn)到準(zhǔn)線的距離，四邊形為菱形，∴，∴，∴，∴，∴，∴向量與的夾角為。

17．(10分)解析：（Ⅰ）由正弦定理得，，，…2分

∴，，………4分

（Ⅱ）∵，，∴，∴，………………………6分

又∵，∴，∴，………………………8分

∴。………………………10分

18.解析：（Ⅰ）∵，∴；……………………理3文4分

（Ⅱ）∵三科會(huì)考不合格的概率均為，∴學(xué)生甲不能拿到高中畢業(yè)證的概率；……………………理6文8分

（Ⅲ）∵每科得A，B的概率分別為，∴學(xué)生甲被評為三好學(xué)生的概率為�！�12分

（理）∵，，，�！�9分

∴的分布列如下表：

0

1

2

3

∴的數(shù)學(xué)期望。……………………12分

19．(12分)解析：（Ⅰ）時(shí)，

，，

    

由得， 或   ………3分

 

 

+

0

－

0

+

遞增

極大值

遞減

極小值

遞增

，      ………………………6分

（Ⅱ）在定義域上是增函數(shù)，

對恒成立，即 

   ………………………9分

又（當(dāng)且僅當(dāng)時(shí)，）

               

 ………………………4分

學(xué)科網(wǎng)(Zxxk.Com)              

20．解析：（Ⅰ）∵∥，，∴，∵底面，∴，∴平面，∴，又∵平面，∴，∴平面，∴�！�4分

（Ⅱ）∵平面，∴，，∴為二面角的平面角，………………………6分

，，∴，又∵平面，，∴，∴二面角的正切值的大小為。………………………8分

（Ⅲ）過點(diǎn)做∥，交于點(diǎn)，∵平面，∴為在平面內(nèi)的射影，∴為與平面所成的角，………………………10分

學(xué)科網(wǎng)(Zxxk.Com)∵，∴，又∵∥，∴和與平面所成的角相等，∴與平面所成角的正切值為�！�12分

解法2：如圖建立空間直角坐標(biāo)系，（Ⅰ）∵，，∴點(diǎn)的坐標(biāo)分別是，，，∴，，設(shè)，∵平面，∴，∴，取，∴，∴�！�4分

（Ⅱ）設(shè)二面角的大小為，∵平面的法向量是，平面的法向量是，∴，∴，∴二面角的正切值的大小為�！�8分

（Ⅲ）設(shè)與平面所成角的大小為，∵平面的法向量是，，∴，∴，∴與平面所成角的正切值為。………………………12分

21.（Ⅰ） 解析：如圖，設(shè)右準(zhǔn)線與軸的交點(diǎn)為，過點(diǎn)


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