cho hàm số y = -x^3 + 3x +3 có đồ thị hàm số (C). Gọi d=ax+b là đường tiếp tuyến của đồ thị hàm số (C) có hệ số góc lớn nhất. Khi đó a.b = ?

Cứu e với mọi người ơi 

(tìm số nguyên x ,biết )

-1/5=4/10x

Sos♥♡

Cho các ví dụ về chủ đề hãy làm việc tốt về chính bạn

Cho tam giác ABC vuông tại A và có đường cao AH (H ∈ BC). Biết AB = 3 cm, AC = 4 cm.

a) Chứng minh tam giác HBA ∼ ABC 

b) Tính độ dài đường cao  AH

c) Đường phân giác của góc ABC cắt AH, AC lần lượt tại M và N. Chứng minh: MA · NA = MH · NC

Part 2. Read the passage and circle the correct answers A, B, C or D

Vietnam’s New Year is celebrated according to the lunar calendar. It is especially known as Tet Nguyen Dan, or Tet. It begins between January twenty- first and February nineteen. The exact date changes from year to year. Vietnamese people usually make preparations for the holiday several weeks beforehand. They tidy their houses, cook special food, clean and make offerings on the family altars. On the New Year’s Eve, people sit up to midnight to see New Year Eve, then they put on new clothes and give one another the greetings of the season. Tet lasts ten days. The first three days are the most important. Vietnamese people believe that how people act during those days will influence the whole year. As a result, they make every effort to avoid arguments and smile as much as possible.

1. What is Vietnam’s New Year known as?

________

2. What would be the best title for the passage?

________

3. Do people sit up to midnight on the New Year’s Eve?

_________.

4. How long does Tet last?

_________

5. What does the word "they" in the last sentence refer to?