Cho 1 đt (O) và (O') cắt nhau tại A và B. Vẽ tiếp tuyến tại A với đường tròn (O') cắt đt (O) tại E. Vẽ tiếp tuyến tại A với đt(O) cắt đt (O') tại F

a) CM: tam giác ABE đồng dạng tam giác FBA

b) Từ M vẽ MN song song AE( N thuộc AF), vẽ MH song song AE(H thuộc AE). CM: tam giác BEH đồng dạng tam giác BAN

Cho đường tròn (O). AB là dây của đường tròn (O) sao cho góc AOB=90. M bất kì trên cung nhỏ AB. AM cắt OB tại C

a) CM: góc ABM= góc ACB

b)Khi M thay đổi trên cung nhỏ AB thì tâm đường tròn ngoại tiếp tam giác BMC luôn thay đổi trên 1 đgt cố định

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.

If you want to prepare yourself for great achievement and have more to (1) _______ to your education or your work, try reading more books. Pick (2) _______ some of the interestingly informative books and search for well-researched materials that can help you grow.

We should encourage our children to read more books and spend less time watching TV. Some people have commented that this is inconsistent. "Why is the written word a superior way to get information than television?" That is an interesting point of view worth further (3) _______. Reading is a skill that is in much greater demand than the demand for watching TV. There are no jobs (4) _______ require a person to be able to watch TV but reading is an integral part of many jobs. The written word is an incredibly flexible and efficient way of communication. You can write something down and, in no time, it can be communicated to many different people. Not only that, we can (5) _______ vast amounts of information through reading in a very short time. A good reader can acquire more information in reading for two hours than someone watching TV can acquire in a full day. You are able to gain a lot of information quickly because you are a fast reader with good comprehension skills. It will save you massive amounts of time and you will be able to assimilate vast quantities of information.

Điền vào ô 4.

A. that

B. who

C. when

D. whom

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

There (A) are twenty species of wild roses in North America, all of which have (B) prickly stems, pinnate leaves, and large flowers, (C) which usually smell (D) sweetly.

A.are

B.prickly

C.which

D.sweetly

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

He not only (A) composed popular songs (B) for musicals, (C) and wrote (D) more serious concerts.

A.composed

B.for

C.and

D.more serious

Cho biểu thức M =  - 3 n - 1  với n là số nguyên:

a) Số nguyên n phải có điều kiện gì để M là phân số?

b) Tìm phân số M, biết n = 3; n = 5; n = -4.