a, (3x + 4)² + (4x - 1)² + (2 + 5x)(2 - 5x)

b, 3x (x - 4) - x (5 + 3x) 

Rút gọn hằng đẳng thức sau

a, 6x² -(2x - 3)(3x + 2) - 1.

b, (x - 3)(x + 7) - (x + 5)(x - 1).

Tìm x, biết:

a, (3x-1) (2x+7) - (x+1) (6x-5) = 16

b, (10x+9) . x - (5x-1) (x+3) = 8

GIÚP MÌNH VỚI

Chứng minh rằng giá trị biểu thức không phụ thuộc vào giá trị của biến.

(x-y)(x³+x²y+xy³+y³-x⁴+y⁴)

Chứng minh rằng giá trị biểu thức không phụ thuộc vào giá trị của biến.

(x-y)(x³+x²y²+xy³+y³-x⁴+y⁴)

Ex1: Xắp xếp lại câu và chia động từ (nếu có)

1. How/stay/there/long/he/did?

2. Linda's/teach/how/mother/to/she/make/when/cake/was/6/her.

Ex2: Điền từ và chia động từ vào các câu

Complain  Buy  Spend  Take  Decide  Cost  Rush

1. Her neighbours____to us about the noise that her family made yesterday.

2. Tuan____to give up smoking 4 months ago.

3. Last week, Nam____a new car. Now it belongs to someones else.

4. They____a lot of money last week. They____$50 for a new dress.

5. Phong____because he wasn't in a hurry.

Ex1: Chuyển các động từ sau sang dạng bất quy tắc ở thì quá khứ.

Go => ____

Tobe =>____

Become =>____

Begin =>____

Catch =>____

Forget =>____

Lay =>____

Say =>____ 

Run =>____

Write =>____

Ex2: Bài tập chia động từ ở thì quá khứ đơn.

1. I (watch)____"Hary Potter" 3 years ago.

2. Kim (pass)____the exam because she (learn)____very hard.

3. Hoang (go)____to Korea to see his grandparents yesterday.

4. They (not/ drink)____anything because they (not/be)____thirty.

5. My mother (buy)____a chicken and some vegetables yesterday.

6. She (feel)____so tired that she (go)____ straight to bed.

7. ____he (hear)____the news this morning on TV?

8. Minh (arrive)____lite and (miss)____the bus.

9.Tom (clean)___his room before school yesterday.

10. His father (turn)____off the TV sfter the news.

11. Last month, she____(visit) Hoan Kiem lake in Hanoi with her parents.

12. Minh and Tony____(see) dolphins and turtles at ABC aquarium in Nha Trang.

13. They____(think) the drink was wonderful in this restaurant.

14. A: What____you____(do)last Monday?

B: I____(prepare) lunch with my mother.

15. She____(lend) my notebook, but the still gives back.

16. Phong sometimes____(wear) glasses for reading books.

17. ____she____(buy) a new blue laptop 6 years ago?

18. Her friend____(spend) all his money last month.

19. His uncle____(build) the bridge with his friend last year.

20. They____(sleep) badly last night.

HELP ME!!!!

Ex1:Bài tập chọn đáp án đúng nhất ở thì HTĐ

1. The swimming bath opens/ open at 8 a.m and close/ closes at 7 p.m everday.

2. The sun don't rise/ dosen't rise in the west. It rises/ rise in the east.

3. Peter takes/ take photographs of the ants.

4. Nam repair/ repairs his car twice a year.

5. We plays/ play the guitar, but we doesn't play/ don't play very well.

Ex2:Bài Tập chữa lỗi sai ở thì hiện tại đơn

1. Lim catch 4 dogs and 5 cats.

2. How many of those people do you knows?

3. Binh sometimes forget my birthday.

4. That flowers smell very sweet.

5. My best friend know a lot about cars. He work at a garage.

6. His teacher meet with students after class.

7. They has a new job. They work for an office supply company.

8. Does you get home until 4:00 in th afternoon?

9. His friends has a break from 10:30 to 10:45 the morning.

10. Hoang listen to music every night after working.

Bài 1

P(x)= -x(x + 5) - (2x - 3) + x²(3x - 2)

Q(x) = 2x(x + 1) + 3x(5 - x) - 7(x - 5)

Bài 2

a, P(x) = 5x⁴ + 3x² - 3x⁵ + 2x - x²(3x - 2) và Q(x) = x⁵ - 4x⁴ + 7x - 2 + x² - x³ + 3x⁴ - 2x²

 b, H(x) = (3x⁵ - 2x³ + 8x + 9) - (3x⁵ - x⁴ + 1 - x² + 7x) và R(x) = x⁴ + 7x³ - 4 - 4x(x² + 1) + 6x

help me

Tìm đa thức M, N biết:

1

a, A=(2,4 x² + 1,7y² + 2xy) - (0,4x² - 1,3y² +xy)

b, B=(6,7xy² - 2,7xy + 5y²) - (1,3xy - 3,3y² +5y²)

2

a, (6x² - 3xy²) + M = x² + y² - 2xy²

b, N - (2xy - 4y²) = 5xy + x² - 7y²

GIÚP MÌNH VS :v