2019版八年级数学下册第五章分式与分式方程1认识分式(第3课时)教学课件(新版)北师大版.ppt

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1 认识分式 第3课时,1.理解约分的概念和理论根据. 2.会用分式的基本性质将分式约分.,分数的约分,约去分子与分母的最大公约数,化为最简分数.,这一过程实际上是将分式中分子与分母的公因式约去.,根据分式的基本性质,把一个分式的分子与分母的公因式约去.,分式约分的依据是什么?,分式的基本性质.,观察下列化简过程,你能发现什么?,例1 约分:,分子与分母没有公因式的分式称为最简分式.,【例题】,化简下列分式: (1) (2),【跟踪训练】,1.化简 的结果是( )A. B. C. D.,【解析】选D.,2.(盐城中考)化简: = 【解析】,答案:x+3,【解析】原式=x-y+1.答案:x-y+1,3.(中山中考)化简:,通过本课时的学习,需要我们掌握 1.分式的基本性质; 2.约分是根据分式的基本性质的“等值”变形; 3.约分的最后的结果必须是最简分式.,成功并不能用一个人达到什么地位来衡量,而是依据他在迈向成功的过程中,到底克服了多少困难和障碍。 布克华盛顿,

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