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【简答题】
下面的三个图形分别是从什么方向看到的? ( 填“上”正“”或“左” ) 2. 下面是用小正方体搭建的一些几何体。 (1) ( ) 从左面看到的是 , ( ) 从正面看到的是 (2) 如果从正面看到的和5相同,用 4 个小正方体摆一摆,有 ( ) 种不同的摆法。 3 .从同一个方向观察一个正方体最多只能看到 ( ) 个面。 4 .用小正方体搭一个几何体,从上面和左面看到的图形如图所示。 搭这个几何体最少需要 ( ) 个小正方体,最多需要 ( ) 个小正方体。 5. (1) 在图 1 中添上一个同样大的小正方体,使得从左面看到的图形不变,有 ( ) 种不同的摆法。 (2) 在图 2 中添上一个同样大的小正方体,使得从上面看到的图形不变,有 ( ) 种不同的摆法。
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