【Overview】 This reference book provides detailed explanations of fundamental problems in Mathematics I・A and II・B. 【Features】 Each chapter includes explanations of formulas and specific problems, along with comprehensive commentary to deepen understanding. 【Target Audience】 This is ideal material for high school students and exam candidates, recommended for those who want to firmly establish a foundation in mathematics. - Title: Mathematics I・A Fundamental Problem Elaboration - Title: Mathematics II・B Fundamental Problem Elaboration - Publisher: Obunsha Sold as a set. Individual sales are also possible. Both have writing and signs of use. Please purchase only if you understand and accept this.