C65 F Ck There Is Someone Behind Me

After reading the rules, the papers were quickly distributed to everyone.

The introduction to the examination paper was divided into three questions.

The first question was set as A, B was a double-curve X - Y / 2 2 = 2 points on Z, N (1, 2) was the middle point of the line AB, and the line AB was divided vertically into two parallel lines. D 2 points