Bài 2: Cho tam giác ABC vuông ở C, có góc A bằng 600. tia phân giác của góc BAC cắt BC ở E. Kẻ EK vuông góc với AB (K thuộc AB).Kẻ BD vuông góc với tia AE (D thuộc tia AE). Chứng minh:
A)Biết AB = 8cm, AC = 4cm, tính BC?
B)Tam giác CAE bằng tam giác KAE. Từ đó suy ra: AC = AK
C)AE vuông góc CK. Từ đó suy ra KC // BD.
D)BD = BK = CA.
Would, disappear, wrong, common, cough, fell, slight, symptoms, take, headache
Lan: Good morning!
Doctor: Good morning! Take a seat, please! What's................(1) with you?
Lan: Yes, I have a.................(2) and a stomachache. I.......... (3) very tired.
Doctor: Well, I need to......................(4) your temperature first.
Lan: OK
Doctor:................(5) you open your mouth, please? Thanks! That's is 39 C. You have
a...................(6) fever. Do you have a runny nose, coughing, and sneezing?
V. Write the questions for the underlined words:
1. Minh brushes his teeth (twice a day).
→……………………………………………………………………………………
2. Simon is in a lot of pain now (because he has a toothache).
→……………………………………………………………………………………
3. I felt (sick) after eating that food.
→……………………………………………………………………………………
4. Nga went to see the dentist (last week).
→……………………………………………………………………………………
5. (Dr Lai) will check your teeth.
→……………………………………………………………………………………
6. It took Dr Phong (10 minutes) to fill Van’s tooth.
→……………………………………………………………………………………
7. My brother is going to (the hospital).
→……………………………………………………………………………………
8. Mr. Cuong (did morning exercises) at 5.30 yesterday.
→……………………………………………………………………………………
9. Hoa received her aunt’s letter (five days ago).
→……………………………………………………………………………………
10. There are (twelve) students in Lien’s class having toothache.
→……………………………………………………………………………………
V. Write the questions for the underlined words:
1. Minh brushes his teeth twice a day.
→……………………………………………………………………………………
2. Simon is in a lot of pain now because he has a toothache.
→……………………………………………………………………………………
3. I felt sick after eating that food.
→……………………………………………………………………………………
4. Nga went to see the dentist last week.
→……………………………………………………………………………………
5. Dr Lai will check your teeth.
→……………………………………………………………………………………
6. It took Dr Phong 10 minutes to fill Van’s tooth.
→……………………………………………………………………………………
7. My brother is going to the hospital.
→……………………………………………………………………………………
8. Mr. Cuong did morning exercises at 5.30 yesterday.
→……………………………………………………………………………………
9. Hoa received her aunt’s letter five days ago.
→……………………………………………………………………………………
10. There are twelve students in Lien’s class having toothache.
→……………………………………………………………………………………
Cho tam giác ABC có CA = CB = 10cm, AB = 12cm. Kẻ CI vuông góc với AB (I thuộc AB)
a) C/m rằng tam giác IAC bằng tam giác IBC. Từ đó suy ra: IA = IB.
b) Tính độ dài IC.
c) Kẻ IH vuông góc với AC (H thuộc AC), kẻ IK vuông góc với BC (K thuộc BC).
So sánh các độ dài IH và IK.
Giúp mình với mọi người, mình đang cần gấp!