Xét sự tương đương của các phương trình sau ? 18x + 5 = 8x + 15 và 10x = 10

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

 _________ my homework last week, I would have got a good mark.

A. If I did

B. I had done

C. Had I done

D. Only if I done

Biết đồ thị hàm số y =  a x 3 + b x 2 + c x + d có 2 điểm cực trị là (-1;18) và (3;-16). Tính a+b+c+d

A. 0

B. 1

C. 2

D. 3

Choose the item among A,B,C or D that best answers the question from 31 to 35 about the passage

Millions of people of all ages enjoy a hobby which is both interesting and fun. And every year, more and more people start a stamp collection (31)……..their own and discover an interest which can last a lifetime. Starting your collection is easy (32)…….stamps can be found everywhere. Holiday postcards from friends, birthday cards from relatives and letters from pen pals can all (33)………you with stamps from all over the world. But once you have started collecting (34)………, you will probably want to join the Stamp Collectors’ Club which (35)…….to provide collectors with new British stamps.

Question 33:

A. export

B. provide

C. consider

D. take

Hãy chọn khẳng định đúng trong các khẳng định sau

A.  x ∈ A \ B ⇔ x ∈ A x ∉ B

B.  x ∈ A \ B ⇔ x ∈ A x ∈ B

C.  x ∈ A \ B ⇔ x ∈ B x ∉ A

D.  x ∈ A \ B ⇔ x ∈ A x ∉ B

Số thích hợp để viết vào chỗ chấm là: 

2 m 2   5 d m 2 = . . . . . d m 2

A. 25 d m 2

B. 205 d m 2

C. 250 d m 2

D. 2005 d m 2