The elective courses of 1 and 17 do not belong to the scope of college entrance examination at all, and can be used as the scope of independent enrollment examination. 03 elective course 1 series is the requirement of liberal arts college entrance examination.
2. 17 Curriculum standards High school mathematics electives Class A and Class B textbooks are aimed at students who are interested in learning mathematics, physics, economics and engineering at the university level, and learn the basic knowledge of mathematics at the university level in advance. Elective 3 is a wide range of knowledge, including number theory, spherical geometry, optimization methods and so on.
Xiao Min's reasoning is incorrect. Omit correct reasoning.
Question 2: The condition is or. Prove it briefly.
Question 3: To judge whether two triangles are co