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讨论：什么样的图形叫做 平行四边形 ？ 什么样的图形叫做 梯形 ？

(3). (1). (2). (5). (6). (4). 平行四边形. 梯 形. 思考：平行四边形和梯形有哪些相同点和不同点？. 讨论：什么样的图形叫做 平行四边形 ？ 什么样的图形叫做 梯形 ？. 平行四边形. 平行四边形. 长方形. 梯 形. 正方形. 平行四边形 长方形 正方形 梯形. 四 边 形. 这个图形是平行四边形吗？为什么？.

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讨论：什么样的图形叫做 平行四边形 ？ 什么样的图形叫做 梯形 ？

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  1. (3) (1) (2) (5) (6) (4) 平行四边形 梯 形 思考：平行四边形和梯形有哪些相同点和不同点？ 讨论：什么样的图形叫做平行四边形？ 什么样的图形叫做梯形？

  2. 平行四边形

  3. 平行四边形 长方形 梯 形 正方形 平行四边形 长方形 正方形 梯形 四 边 形

  4. 这个图形是平行四边形吗？为什么？

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