Bài tập:

a) 3x(x+3)(x+1)÷ 3(x+1)

b) 3x(x+3(x+1)÷ (x+3)

c) 2x(x+2)³÷ (x+2)

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Chuyển các câu dưới đây sang dạng số nhiều:

1. This is a stereo

2. Is that an eraser? No , it isn't

3. There is one bookshelf on the wall

4. Is there one waste basket in your class? Yes , there are

5. It's a door

6. I am a student

7. Are you an engineer? No , I am not

8. What is your name?

9. Who is that?

10. Is this your student? Yes , it is

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