số trung bình cộng của 2 số dó bằng 8 , biết 1 trong 2 số bằng 9 , tìm số kia

Mọi người giải 2 bài này giúp e với ạ

Dinosaurs died out long before people appeared. Dinosaurs lived from about 230 million years ago to about 65 million years ago. There are several theories about why dinosaurs became extinct. Many scientists believe that there was a sudden, (22) _____ event. They think that an asteroid or comet (23) _____ with the earth. Fire from the impact burned large areas. Dust blocked sunlight from (24) _____ the surface of the earth. Acid rain fell everywhere. Plants could not grow. There was no food for the plant-eating dinosaurs, so they died out. Other scientists think that the environment changed. Maybe the (25) _____ grew colder and dinosaurs slowly became extinct over several million years. Many scientists think that birds descended from a small kind of dinosaur. If this is true, then dinosaurs are still (26) _____ in the form of modern birds. 22. A. violet B. violence C. violent D. violently 23. A. crashed B. collided C. confronted D. met 24. A. reaching B. arriving C. approaching D. coming 25. A. days B. atmosphere C. weather D. climate 26. A. lively B. alive C. living D. live

Trong mặt phẳng oxy cho 3 điem A(2,1) B(-2,5). C(6,3) a) viết phuong trình tham số cua đoạn thẳng BC b viết pt tham số cua trung tuyếnnAM

IV. Read the following passage about the Statue of Liberty in New York. Decide if the statements are true (T) or false (F). Circle T or F. The Statue of Liberty is situated in New York Harbour. It was a gift to the United States from the people of France. The statue's 300 copper pieces were transported to America on a ship. In 1886, the statue was the tallest iron structure ever built. From the ground to the top, it measures 93 metres. Lady Liberty holds a torch in one hand and a tablet in the other. On the tablet is the date of America’s first Independence Day, July 4, 1776. A broken chain lies at her feet. The statue is a symbol of freedom. Approximately four million people visit the statue each year. The statue will be celebrating its 130th birthday in October 2016. 1. The Statue of Liberty was built in the United States. T F 2. The Statue of Liberty is the tallest iron structure now. T F 3. The statue was brought to America in separate pieces. T F 4. The statue is an icon of freedom T F 5. The Statue of Liberty is 130 years old. T F CÂU SAI SỬA LẠI CHO MÌNH NHÉ

Tìm x nguyên để căn x+1 chia hết cho căn x-3

ae cho mình hỏi tại sao đường chéo lại là kx vậy

Sinh tố (vitamin) tan trong nước là: giup mik voi

chỉ cần làm giống như thế thay đổi

Quân đội đồng minh nào đã có mặt tại VN sau thế chiến thứ 2 ?