一、钻研教材,明确目标这部分内容是人教版九年义务教育第十册第三单元第二小节的内容,是在约数、倍数的基础上进行教学的,它是分解质因数、求最大公约数、最小公倍数的重要基础,还是学习约分、通分知识的必要前提。在学习分数的时候,约分和通分掌握得是否熟练,对于分数运算有 First, to study textbooks, a clear goal This part is the content of the second section of the third edition of the tenth part of the nine-year compulsory education in the PEP, is in the divisor, multiples of the teaching, it is the decomposition of the quality factor, and The greatest common divisor, the most important factor of the least common multiple, or learning about points, the necessary prerequisite for common knowledge. In learning scores, about points and pass points to master whether it is proficient, for the fractional operation