小学二年级数学上册-经典习题及答案
二年级数学经典习题及答案1.下图是由6个边长都是2厘米的正方形拼成的,你能算出这个图形的周长是多少厘米吗? 解答:(4+2)×2=12 (厘米)【小结】这个不规则的图形可以通过平移的方法变成规则的图形,具体操作如下:这样我们就发现,这个不规则图形就可以变成一个长方形.此长方形的长是:4厘米,宽是2厘米.周长是:(4+2)×2=12 (厘米)2.猪八戒化斋讨来一些馒头.第一次吃了一半,觉得不够,第二次又吃了剩下的一半,还是觉得不够,第三次又吃了一半,最后还是有点馋又偷偷吃了3个馒头,觉得饱了.把剩下的给师傅们吃,孙悟空一看发现篮子里只剩下5个馒头了.猪八戒一共讨回来多少个馒头?解答:...
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