2019年春八年级数学下册第十六章二次根式16.2二次根式的乘除16.2.1二次根式的乘法课件（新版）新人教版.pptx

16.2 二次根式的乘除,第1课时 二次根式的乘法,学前温故,新课早知,a,a,-a,=,学前温故,新课早知,4,77,【例题】 判断下列各式是否正确,不正确的请予以改正:,1,2,3,4,5,6,A.a0,b0 B.a0,b0 C.a0,b0 D.a0,b0,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,3.下列计算正确的是( ).,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,