1. This winter/ we/ close/ curtains/ night/ stop heat escaping.

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      2. We/ switch/ energy saving/ light bulbs/ old bulbs/ break.

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      3. Travelling/ train, bus or bike/ much better/ planet.

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      4. making simple lifestyle changes/ greenhouse gas emissions/ the US/ cut down/ 2020.

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      5. the US/ 21 percent/ all energy used/ consumed in homes.

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      6. Your/ carbon footprint/ the amount/ carbon dioxide/ released/ the air/ because/ own energy needs

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      7. Up to/ 30%/ a household/ energy footprint/ moving water.

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      8. early/ 2007/ the UK/ introduced/ lot/ conservation projects/ reduce/ electricity consumption

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Hoàn thiện bài thu hoạch thực hành: Xem băng hình về đời sống và tập tính của thú

liệt kê lớp thú nha 

a) Cho hai đa thức:   M = 2x² – 2xy – 3y² + 1;     N = x² – 2xy + 3y² – 1

Tính M + N; M – N.

b) Cho hai đa thức: P(x) = x³ – 6x + 2; Q(x) = 2x² - 4x³ + x - 5

+ Tính P(x) + Q(x)

+ Tính P(x) - Q(x)

(Nghỉ dịch từ ngày 28/2/2022)

Bài 1:

a) Cho hai đa thức:   M = 2x² – 2xy – 3y² + 1;     N = x² – 2xy + 3y² – 1

Tính M + N; M – N.

b) Cho hai đa thức: P(x) = x³ – 6x + 2; Q(x) = 2x² - 4x³ + x - 5

+ Tính P(x) + Q(x)

+ Tính P(x) - Q(x)

Bài 2: Tìm x biết:

a) (x - 8 )( x³+ 8) = 0;               b) (4x - 3) – ( x + 5) = 3(10 - x)

Bài 3: Cho đa thức:   P(x) = 5x³ + 2x⁴ – x² + 3x² – x³ – 2x⁴ + 1 – 4x³.

a) Thu gọn và xắp sếp các hạng tử của đa thức trên theo lũy thừa giảm của biến.

b) Tính P(1) và P(–1).

Bài 4:  Tính nhanh (nếu có thể):

Bài 5: Cho tam giác ABC có AB = AC = 5cm, BC = 6cm. Đường trung tuyến AM xuất phát từ đỉnh A của tam giác ABC.

a) Chứng minh ΔAMB = ΔAMC và AM là tia phân giác của góc A.

b) Chứng minh AM vuông góc với BC.

c) Tính độ dài các đoạn thẳng BM và AM.

d) Từ M vẽ ME AB (E thuộc AB) và MF AC (F thuộc AC). Tam giác MEF là tam giác gì? Vì sao?

Bài 6: Cho ΔABC cân có AB = AC = 5cm, BC = 8cm. Kẻ AH vuông góc với BC.

a) Chứng minh: HB = HC.

b) Tính độ dài AH.

c) Kẻ HD vuông góc với AB (D∈AB), kẻ HE vuông góc với AC (E∈AC).

Chứng minh ΔHDE cân.

d) So sánh HD và HC.

1. you/ Who/ wii/ be/ at/ time/ this/ waiting/ week/ for/ next?

…………………………………………………………………………..

2. dinner/ will/ My/ preparing/ mother/ 5 o’clock/ afternoon/ be/ at/ tomorrow.

…………………………………………………………………………………

3. Mr. Vu/ teaching/ class/ at/ tomorrow/ Will/ 8.a.m/ be/ your/ in?

…………………………………………………………………..

4. I /be/ will/ think/ sleeping/ hour/ now/ I/ an/ from.

…………………………………………………………………………

5. you/ this/ will/ Where/ going/ week/ be/ time/ at/ next?

……………………………………………………………………………

6. not/ playing/ time/ this / tomorrow/ at / Jane/ will/ be.

………………………………………………………………

7. here/ A/ singer/ performing/ famous/ will/ at/ be/ 8a.m./ tomorrow.

……………………………………………………………………….

8. be/ swimming/ pool/ at/ time/ in/ will/ Mary/ next/ people/ month/ this/ this/ month.

……………………………………………………………………….

Bai 3. Khoanh tròn đáp án đúng

1. Will you be playing the piano at this time tomorrow/ No, I (won’t/ won’t be)

2. My father will (be going/go) on a business trip at this time next month.

3. Jim promises he will (be going/go) to the book store with me tomorrow.

4. I think my cat will (be waiting/wait) for me at home at this time tomorrow.

5. These students will (be working/ work) on their end-of-term project at this time next week.

6. I think Josh won’t (be lying/lie) me again.

7. I will (be lying/lie) on my bed an hour from now.

8. At midnight today, everyone won’t (be sleeping/ sleep) because they want to see the fireworks.

9. Will you (be coming/come) to my birthday party tomorrow, Ann?

10. I think It will (be raining/ rain) at this time next month.

11. I will (be talking/ talk) with my foreign friend at this time next week.

12. I don’t think that Jim will (be winning/ win) the competition tomorrow.

13. My sister will (be having/ have) dinner with her boyfriend at 7.p.m tomorrow.

14. Jim will (be learning/ learn) Japanese because he likes it.

15. Mr. Smith will (begoing/ go) shopping with me tomorrow.

Bai 3. Khoanh tròn đáp án đúng

1. Will you be playing the piano at this time tomorrow/ No, I (won’t/ won’t be)

2. My father will (be going/go) on a business trip at this time next month.

3. Jim promises he will (be going/go) to the book store with me tomorrow.

4. I think my cat will (be waiting/wait) for me at home at this time tomorrow.

5. These students will (be working/ work) on their end-of-term project at this time next week.

6. I think Josh won’t (be lying/lie) me again.

7. I will (be lying/lie) on my bed an hour from now.

8. At midnight today, everyone won’t (be sleeping/ sleep) because they want to see the fireworks.

9. Will you (be coming/come) to my birthday party tomorrow, Ann?

10. I think It will (be raining/ rain) at this time next month.

11. I will (be talking/ talk) with my foreign friend at this time next week.

12. I don’t think that Jim will (be winning/ win) the competition tomorrow.

13. My sister will (be having/ have) dinner with her boyfriend at 7.p.m tomorrow.

14. Jim will (be learning/ learn) Japanese because he likes it.

15. Mr. Smith will (begoing/ go) shopping with me tomorrow.

15. A well – known professor (deliver) …….a lecture at my university at 8 a.m.