xl

cho (o AB/2)lấy C thuộc đường tròn sao cho AC= R lấy D thuộ cung BC nhỏ .E là giao điểm cuẩD với BC vẽ dt đi qua E và vuông góc với AB tại H cắt AC tại F chứng minh tứ giác BHCF nội tiếp b) HA.HB=HE.HF

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Question 5: Lady Gaga is an American singer, songwriter and actress, ______?
A. doesn’t

B. is she

C. isn’t Lady Gaga

D. isn’t she
Question 6. Many graffiti without the permission of the owner of the wall.
A. are writing

B. are written

C. is writing

D. is written
Question 7. She likes reading books ______ the library.
A. on

B. at

C. in

D. from
Question 8. The more cigarettes you smoke, you will die.
A. the easier

B. more sooner

C. the sooner

D. faster
Question 9. It's silly of him to spend a lot of money buying .
A. a thick wooden old table

B. a thick old wooden table
C. an old wooden thick table

D. a wooden thick old table
Question 10. When he came, I_______ in the kitchen.
A. cooked

B. am cooking

C. has cooked

D. was cooking

k biết lm

12/x+12,2/x+5=1

x+4=1
5-x=1
x=-3
x=4