五年级数学下册2.2《展开与折叠》课件2北师大版.ppt

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请你找一个正方体的盒子剪一剪,把你得到的展开图画下来。,全班交流,剪出了几种不同形状的展开图?说一 说,分别是如何得到的。,同伴合作,把每一种展开图重新折叠成正方体。,第一类: 中间四连方,两侧各一个。,结构特点,一,四,一,第二类: 中间三连方,两侧各有一、二,个。,结构特点,三,一,第三类: 中间二连方,两侧各有二个,只有一种。,第四类: 两排各三个,只有一种。,下面是一个长方体和一个正方体的展开图,请分别说出与1号、2号、3号面相对的各是几号面?,1,2,3,4,5,6,1,2,3,4,5,6,正方体展开图的对面,1、如图不是正方体的平面展开图是( ),方法总结:“田”字型、“凹”字型的不是正方体的平面展开图;,A,B,C,D,A,练一练,2.如图所示的两个平面图形,分别能折成什么立体图形?,(1),(2),练一练,1.下面的图形分别是上面哪个盒子的展开图?想一想,连一连。,2.下面哪些图形沿虚线折叠后能围成正方体吗?先想一想,再利用附页1中的图2试一试。,3.下面哪些图形沿虚线折叠后能围成长方体吗?先想一想,再利用附页1中的图1试一试。,3将下图中上边的图形折叠起来围成一个正方体,应该得到右图中( ),先想一想,再做一做.,D,练一练,

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