Tính :

A) 2x.(x+1)

B) (5x - 6)(x - 2)

C) (10x^4y^2 - 5x^3y^2 + 15xy^4) : 5xy

Phân tích đa thức thành nhân tử :

D) 2x(x+y) - 3(x+y)

E) 4x^2 - 49

Tìm x :

x(x+2) - 2x-4 = 0

Tính :

A) 2x.(x+1)

B) (5x - 6y)(x - 2)

C) (10x^4y^2 - 5x^3y^2 + 15xy^4) : 5xy

D) 2x(x+y) - 3(x+y)

E) 4x^2 - 49

Chứng minh

x(x+2) - 2x-4 = 0

Chuyển câu trực tiếp sang câu gián tiếp

He said to her: " You are my friend".

=>

Can you help me (get) .............the dinner ready?

Rút gọn các phân số sau:

a ) 15 35 b ) − 26 39     c ) − 45 − 75 d ) 16. ( − 5 ) 20.12   e ) ( − 35 ) .3.10 14.15.6 f ) 15.39 − 15 57

Tìm x, biết:

a ) 4 7 . x + 2 3 = − 1 5 b ) 2 9 − 7 8 . x = 1 ; c ) 4 5 + 7 6 : x = 1 6 d ) 5 7 : x − 1 = 2 3

a)  Tìm số liền trước của các số nguyên : 3 ; - 5 ; 0 ; 4

b ) Tìm số liền sau của các số nguyên : - 10 ; - 5 ; 0 ; - 15

c ) Tìm số nguyên a, biết số liền trước a là số nguyên âm, số liền sau a là 1 số nguyên dương.

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 to 29.

Nowadays people are more aware that wildlife all over the world is in (25) ___________. Many species of animals are threatened, and could easily become (26) ___________ if we do not make an effort to protect them. There are many reasons for this. In some cases animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (27) ___________, and sold as pets. For many animals and birds, the problem is that their habitats-the place where they live-is disappearing. More land is used for farm, for houses and industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them grow better crops, (28) ________these chemicals pollute the environment and harm wildlife. The most successful animals on Earth, human beings, will soon be the only ones (29) ___________ unless we can solve this problem.

Điền vào ô 26.

A. disappeared

B. vanished 

C. extinct

D. empty