Cho 3 điểm A(2;1) B(-1;-2) và C(0;-1)

a. Viết phương trình đường thẳng

b. Chứng minh 3 điểm A, B, C thẳng hàng.

c. Tìm a và b để (d): y=(2a-b)+3a-1 đi qua B, C

Cho tam giác nhọn ABC nội tiếp (O). M, N, P lần lượt là điểm chính giữa của các cung AB, BC, CA. Gọi I là giao điểm của AB và MN, K là giao điểm của BP và AN, J là giao điểm của AC và PN. Chứng minh rằng:

a) ∠BKN = ∠CJN.

b) Tam giác NBK cân, tam giác IBK cân.

c) IK song song với BC, ba điểm J, K, I thẳng hàng.

Giúp mình bài 1 với. Mình đang cần gấp sẽ tick hết

a) (3x + 1) (5 - x) - 7 = 0

c) 4x² + 2 [( căn 7) - 3]x trừ 3 căn 7 =0

I. Fill in the blanks with " who, whom, whose, where, which, when,.... ( còn nữa) necessary.

1. Can you give me back the money ............. I lent you last month?

2. This is the restaurant ............... we used to eat when we lived in Boston.

3. Mark has sent me an e-mail .............. I haven't replied yet.

4. Who's the person ................ is sitting next to Nancy?

5. They complained about the wrong goods .............. were sent to them.

6. This is Susan .............. husband works in the sales department.

7. Candy is wearing a new dress .............. she bought in the summer sales.

8. Monday is the day ............. bills have to be paid.

9. The secretary showed me the filling cabinet ................. important documents are field.

10. Do you like the boy .............. Mary ia talking to?

Each sentence below contains an error. Underline it and write the correct answer in the space provided.

1. The astronaut visited our school yestersay morning has flown into space four times. ......................

2. Pham Tuan had been awarded the title Hero of Soviet Union after returning from space. ......................

Give the correct form of the verbs in bracket ( Simple Past or Past Perfect).

1. She already (post) .......... the letter when she (realize) .......... she (send) .......... it to the wrong address.

2. Hardly the car (go) .......... a mile when it (have) .......... a flat tyre.

3. The weather (be) ......... far worse than we (expect) .........

4. They (be married) ......... for five years when they finally (have) ........ a child.

5. No sooner they (sell) .......... their car than they (regret) ........... having done so.

6. When she (finish) ........... her work, she (go) ........... to the cinema.

7. He (not eat) .......... until his parents (come) ............ home.

8. She (tell) ............ me she never (meet) ............... him.

9. He (do) ............... his homework before he (go) ............... out.

10. The light (go) ................ out the moment he (get) ................ into the cinema.