100 nha 

Ex1: Hoàn thành các câu sau, dùng dạng quá khứ của các động từ trong khung :

Buy, Take, Go, Return, Be, Wear, Eat, Receive

1. The seafood is very delicious.

2. Hoa received a letter from her penpal Tim yesterday.

3. I went to the movie theater last night.

4. They eat fish and crab for their lunch.

5. Liz returned to Ha Noi from Nha Trang two days ago.

6. She bought a blue dress in her last brithday party.

7. Mr. Robinson wears Liz a cap.

8. He took his children to the zoo last Sunday.

I .Rewrite the oder words of the folloing sentences:

1.to another/How/people fly from/will/one place?

-> How will people fly from one place to another?

2.to save/will reduce/our energy/ the use of electricity/We/.

-> We will reduce the use of electricity to save our energy.

3.you/have/finished/homework/your/yet?

-> Have you finished your homework yet?

4.children/cookies/milk./and/like/most

-> Most children like cookies and milk.

Tìm lỗi sai và sửa lại cho đúng

Most of students enjoy reading picture books

=> Most students enjoy reading picture books

Tìm x:

a)-2³+0,5x=1,5

-8+0,5x = 1,5

0,5x = 1,5-(-8) = 9,5

x = 9,5:0,5 = 19

b)(−3)x81=−27

(-3)^x:81 =-27

(-3)^x = -27.81 = -2187

(-3)^x = (-3)⁷

=> x=7

c)112.x−4=0,5

1,5.x = 0,5+4 = 4,5

x = 4,5:1,5 = 3

d)123:x4=6:0,3

\(\frac{5}{3}\):\(\frac{x}{4}\) = 20

\(\frac{x}{4}\) = \(\frac{5}{3}\):20 = \(\frac{1}{12}\)

=> x:4 = \(\frac{1}{12}\)

x = \(\frac{1}{12}\).4 = \(\frac{1}{3}\)

III/ Choose the best answer:

A= (n+2)/(n-5) = (n-5+7)/(n-5) = 1 + 7/(n-5)

Để A thuộc Z <=> 7/(n-5) thuộc Z <=> (n-5) thuộc Ư(7) = {+1; +7}

rồi thay từng trường hợp tìm n