Chg minh:x⁴ + x²y² + y⁴ = a² - b²                   Với  x² + y² = a, xy = b

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có sai đecc ko bạn.......

14.where is your father now?

He is reading a book in....

1. The sun (set) sets in the West.

2. It usually (rain) rains in the winter.

3. They (build) are building the building at the moment.

4. Bees (make) make honey.

5. They (get) are getting on the scale now.

6. The Earth (circle) circles the Sun once every 365 days.

7. Rivers usually (flow) flow to the sea.

8. Look! Jane (play) is playing the guitar.

9. Hurry up! The bus (come) is coming.

10. How often does She (go) go ishing?- She (go) goes once a year.

11. Are your friends students? - Yes, they (be) are

12. Daisy (cook) is cooking some food in the kitchen at present.

She always (cook) cooks in the morning.

13.Every morning,Linda(have).....has............breakfast at 6:10.After breafast,she (brush).........brushes.........her teeth.She (go).....goes...............to school at 6:30.She have).........has......lunch at 11:30 at school.

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