Toán Tiếng Anh:

1. How many boxes are crossed by a diagonal in a rectangular table formed by 199 x 991 small squares?
2. The son of a professor's father is talking to the father of the professor's son, and the professor does not take part in the conversation. Is this possible?

Toán Tiếng Anh:

1. How many boxes are crossed by a diagonal in a rectangular table formed by 199 x 991 small squares?
2. The son of a professor's father is talking to the father of the professor's son, and the professor does not take part in the conversation. Is this possible?

6x = 10y = 15z và x + y + z = 90

bài 1.22

bài 1.11