将一个两位数的个位数字与十位数字交换后得到一个新数，它与原数相加，得到的和恰好是某个自然数的平方，这个和是 ．
计算下面各题．===﹣= 1﹣=﹣==﹣==
看谁算得又对又快．======．
3与4的倒数之差是多少？
算一算．+=﹣=+=+=﹣=﹣=
+= 1﹣=+=+= 1﹣=+=﹣=﹣=
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