Mark the letter A, B, c or D on your answ er sheet to indicate the sentence that best combines each pair of sentences in the following questions.

John does a lot of exercise. He’s still very fat.

A. Despite the fact that doing a lot of exercise, John’s still very fat. .

B. John does a lot of exercise, so he’s very fat.

C. Even though John does a lot of exercise, he’s very fat.

D. John’s very fat, but he does a lot of exercise.

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 from 25 to29.

A recent (25) _______ of a language learning magazine has consulted a number of experts in the field of second language acquisition. Their advice may prove invaluable for those considering a language course. One suggestion is that you access whether you are likely to be successful (26)_______ learning a language. Did you enjoy studying language at school, for example? Do you have enough time to learn a language ? The major cost will be your own time and effort. Therefore, you must make sure that course on offer leads to a recognized qualification. Also, be realistic in your (27)_______. If you don’t set achievable aims, you are more likely to give up. Don’t be deceived into thinking that the most expensive courses are the best. Shop around to get the best possible value for money. You should also bear in your mind that the quicker you learn a language, the more quickly you forget it. Sandra Miller, a French teacher, tried to teach herself German by enrolling on a crash course. Already fluent in four languages and with a sound knowledge of teaching methodology her chances of (28)_______ progress were high. Three years on she remembers very little. She feels her biggest mistake was not to follow up her first experience. "I think the teacher’s role is important. It's so nice to have somebody give you a/an (29)_______”.

Điền vào ô 26.

A. at

B. on 

C. in

D. of

58 nha bạn   !!!! ^-^

Đầu tiên bạn lấy a+b+c=x^2+y^2+z^2-xy-yz-zx

Chúng ta sẽ chứng minh đảo ta thế a+b+c vào vế phải ta được

Vế phải=(x+y+z)(x^2+y^2+z^2-xy-yz-zx)=x^3+y^3+z^3-3xyz

Vế trái=ax+by+cz=(x^2-yz)x+(y^2-zx)y+(z^2-xy)z=x^3+y^3+z^3-3xyz

Vậy là xong VT=VP thế thì

ax+by+cz=(x+y+z)(a+b+c) cảm ơn bạn đã cho mình một bài toán hay Thank you hahahaha

Cho A = 12 +15 +36 +x. Với x ∈ N. Tìm điều kiện của x để:

a, A chia hết cho 3

b, A chia hết cho 2

c, A không chia hết cho 2

d, A không chia hết cho 9

leu 1 tang ko phai nha cao tang nen ko co thang