Tổng 2 + 4 + 6 + 8 + ... + 298 + 300 là:

A. Số lớn hơn 45300

B. Số có chữ số tận cùng là 2

C. Số có chữ số tận cùng là 0

D. Số có chữ số tận cùng là 1

True or False?

Volunteer work among Vietnamese students

Hue, 17 years old: Being able to make a difference in the lives of people is a wonderful thing to me. That's why I take part in volunteer work. I've been a volunteer for over three years. Once or twice a week, usually on weekends, I teach English and Math to poor children in Long Bien district. My friends and I also encourage other people to donate books to them. We also tutor some young children who can't go to school.

Ngan, 13 years old: My family spends one Saturday morning a month collecting rubbish or planting trees in our neighbourhood. We are not forced or paid to do it, but we enjoy it. In our village, most families volunteer to do this once a month. We cook and give food to patients in some hospitals. My parents also donate their blood once or twice a year to help sick people. At the end of each year, people in my village raise money for poor and homeless people. We love helping others.

Ngan collects rubbish in the neighbourhood with her family on Saturday mornings.

A. T

B. F

Cho hàm số y=f(x) liên tục trên  ℝ và có đồ thị như hình vẽ. Gọi M và m tương ứng là giá trị lớn nhất và giá trị nhỏ nhất của hàm số y = f(1-2cos x) trên  0 ; 3 π 2 . Giá trị của M + m bằng

A. 2

B. 1

C.  1 2

D.  3 2