Các bạn giúp mình với!Làm bằng cách giải của lớp 9 nha!Cho hai đường tròn (O), (O') tiếp xúc ngoài tại A. Gọi AB là đường kính của đường tròn (O), AC là đường kính của đường tròn (O'), DE là tiếp tuyến chúng của hai đường tròn, D∈ (O), E∈ (O'). K là giao điểm của BD và CE.a, Tính số đo góc DAEb,Tứ giác ADKE là hình gì? Vì sao?c, Chứng minh AK là tiếp tuyến chung của hai đường tròn (O) và (O')d, Gọi M là trung điểm của BC. Chứng minh MK ⊥ DE
VIẾT LẠI CÂU91. My sister offered me a lift so it wasn't necesssary for me to call a taxiAs my sister offered me a lift, I.........................................................................2. If yoy don't rest yourself you really will be illUnless....................................................................3. "I am sorry that I broke the glass" said PeterPeter apologised..................................................4. Sally is the cleverest student in my classNobody............................................................5. I have never read such a romantic storyThis is............................................................7. His parents made him study foar his examHe was................................................................9. He prefers gold to tennisHe'd rather............................10. Speaking English fluetlyis not easyIt................................................................12. Unless he phones her immediately, he won't get any informationIf..................................................................................................................13. The news was so wonderful that she decided to have a celebrationIt was..............................................................................................................14. It was such good weather that we went swimmingThe weather......................................................................
BÀI TẬP VỀ BIẾN ĐỔI CÂU
52. I'd prefer not to go out tounight.
I'd rather.................................................
67. It's nearly ten years since we saw our uncle.
We............................................................
72. You forgot to switch on the washing machine, didn't you?
You didn't.................................................
93. The earthquake his the city at two in the morning.
The city.................................................
94. It was such lovely weather that we decided to spend the day on the beach.
The weather..........................................
96. They will have to change the date of the meeting again.
The date.................................................
97. I haven't got a key, so I can't get in.
If...........................................................
98. Nobody must expect to be rich without hard work.
Unless...................................................
99. I'm too poor to take a space trip.
I'm not...................................................
100. She was tired, but she stayed up late to watch the late dilm on TV.
Although.............................................
101. Since he was careless, Tim lost his job.
Because of........................................
102. Let's go abroad for our holiday this year.
Why...............................................
104. We can't take a trip to space because we don't have enough money.
If we..................................................
105. The astronauts orbited the earth in two hours.
It took.....................................................
Bài tập: Write the second sentence so that it has a similar meaning to the first.
74. Despite their poverty, the children seemed very happy.
Although....................................................................................
75. Whose car is it?
Who.......................................................................................
76. Guy invited a pop singer onto his chat show, but she never turned up.
The pop singer..........................................................................
77. Jane is excited about meeting her old friends again.
Jane is looking......................................................................
78. "Did someone ring you an hour ago, Nancy?" said Martin.
Martin asked............................................................................
79. His parents made him study hard for the exam.
He.............................................................................................
80. Although she was successful, she left dissatisfied.
In spite of................................................................................
81. It snowed heavily, so we couldn't arrive home early.
The snow was so...................................................................
82. They live in a very lovely house.
The house..................................................................................
85. Although Mark felt unwell, he went on working.
Despite.....................................................................................
87. The last time Thuy met her old friends was when they left school.
Thuy hasn't..............................................................................
89. The new about the earthquake distressed Josephine.
Josephine...............................................................................
90. You should take more exercise because that's the way to get fit.
If you.......................................................................................