一年级数学下册第1单元《认识图形(二)平面图形的拼组习题课件新人教版.ppt

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平面图形的拼组,1 认识图形(二),1. (1)将一张正方形纸对折后展开,你能发现什么?,(选题源于教材P6第4题),略,(2)用几张正方形纸剪一剪、贴一贴,再涂上色。 你能做出漂亮的图案吗?,略,2.,(选题源于教材P6第5题),缺了( )块 。,8,3. 右边的图形是长方体的哪个面?用线连起来。,下面,左面,后面,1.选一选,拼一拼。 (1)( )和( )可以拼成正方形。,知识点 1,用同样的图形拼组基本图形,(2)( )和( )可以拼成长方形。,2.沿虚线折一折,填一填。 (1) 折出了两个相同的( )形。 (2) 折出了两个相同的( )形。 (3) 折出了两个相同的( )形。,知识点 2,同一个图形不同的分法分成的图形不同,长方,三角,三角,3.辨一辨。 (1)两个三角形一定能拼成一个平行四边形。 ( ),易错点,辨析:两个相同的三角形一定能拼成一个平行四边形。,(2)两个相同的长方形一定能拼成一个正方形。 ( ),辨析:只有当长方形的长是宽的2倍时,两个相同的长方形才能拼成一个正方形。,4.下面的图形分别是由哪些图形拼成的? ( )形和( )形。 (2) ( )形、( )形和( )。,巧妙拼组图形,正方,三角,三角,长方,圆,5.将一张正方形纸剪成4个一样大的图形,在下面画一画。,(答案不唯一),

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