中美新三国初中数学教材习题综合难度的比较研究——以"三角形的有关角"为例
중미신삼국초중수학교재습제종합난도적비교연구——이"삼각형적유관각"위례
A Comparative Stddy of the Difficdlty of Problem Sets of the Jdnior High School Mathematics Textbooks in China ,the United States and Singapore-Taking"the angle of the triangle" as an example
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