6. Why doesn’t the man complain to the teacher?
A.He is afraid. B. He doesn’t care. C. He is polite.
Conversation 4
5.What was the woman doing before the man came?
A. Phoning to the man. B. Waiting for the man. C. Looking for the man.
4. How much does the man pay for the things he asked?
A. 75 pence B.1.30 pounds. C.2.05 pounds.
Conversation 3
3. What kind of snacks does the man have?
A. Pancake. B. Chips. C. Salad.
2. What is the first gift the clerk suggests to the woman?
A. A chess set. B. A pen or a pencil. C.A handball set.
Conversation 2
1. Who is the woman buying the gift for?
A. Her neighbour. B. Her brother. C. Her nephew.
21.(本小題滿分13分)
已知橢圓C:的左、右焦點(diǎn)分別為,,離心率,直線交橢圓C于M、N。
(1)求橢圓C的方程;
(2)設(shè)橢圓C短軸的上、下端點(diǎn)分別為A、B,若,試求直線BM、BN斜率的乘積;
(3)若原點(diǎn)到直線的距離為,求證:。
()
20.(本小題滿分13分)
一艘輪船在航行中每小時(shí)的燃料費(fèi)和它的速度的立方成正比,已知速度為每小時(shí)10公里時(shí)的燃料費(fèi)是每小時(shí)6元,而其他與速度無關(guān)的費(fèi)用是每小時(shí)96元,問:
(1)若輪船以每小時(shí)24公里的速度航行,求行駛100公里的費(fèi)用總和;
(2)如果甲、乙兩地相距100公里,求輪船從甲地航行到乙地的總費(fèi)用的最小值,并求出此時(shí)輪船的航行速度。
19.(本小題滿分13分)
經(jīng)過點(diǎn)M(2,1),作直線交雙曲線于A、B兩點(diǎn),如果點(diǎn)M為線段AB的中點(diǎn),求直線AB的方程。
18.(本小題滿分12分)
如圖,已知平面,,,,。,分別為,的中點(diǎn)。
(1)求證:平面
(2)求直線與平面所成角的大小。
(3)求證:平面平面
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