All need to be bought. Buying new thinking is the teaching material of mathematical thinking training. This book is helpful to junior high school mathematics learning by cultivating students' mathematical thinking ability, improving students' problem-solving ability and helping students cultivate logical thinking, creative thinking and problem-solving ability. The required question is a set of mathematical exercises, including various types of mathematical problems. Through a lot of practice, students can master mathematical knowledge and problem-solving skills skillfully, and the required questions can help students consolidate their basic knowledge and improve the speed and accuracy of problem solving.