胖胖熊和欢欢猴是一对学习上互相帮助的好朋友。现在,他俩又在一起学习,胖胖熊在按顺序填写1~100的方格时,才填到40(如图),就高兴地说:“欢欢猴,我发现每数到9时,就是一个进一步的转折,十位数多个1,个位数就变成了0。比如数到19,就在十位1上加1变成2,个位变成0,就是20了;数到29时,就在十位2上加1变成3,个位变 Fat Bear and Huanhun Monkey are good friends who learn from each other and help each other. Now, they are studying together again. The fat bears fill 40 in the order of 1 to 100 squares (pictured), and are happy to say, ”Happy Monkey, I found that every number is 9 When it is a further turning point, the tens digit of more than 1, the number of digits becomes 0. For example, to the number of 19, in the ten 1 plus 1 into 2, a bit becomes 0, that is 20 ; Number to 29 when, on the 10 plus 2 into a 3, a bit change