5□6÷57填________數(shù)時,商是兩位數(shù),填________數(shù)時,商是一位數(shù).
0,1,2,3,4,5,或6 7,8或9
分析:(1)除數(shù)是57,要使商是一位數(shù),那么被除數(shù)的前兩位組成的數(shù)字就要小于57,
(2)要使商是兩位數(shù),那么被除數(shù)的前兩位組成的數(shù)字就要大于57,由此即可解答.
解答:(1)要使商是一位數(shù),即5□<57,□的數(shù)只要小于7即可,
□里就可以填0,1,2,3,4,5,6;
(2)要使商是兩位數(shù),即3□≥57,□的數(shù)只要大于或等于7即可,
□里能填7,8,9,
故答案為0,1,2,3,4,5,或6;7,8或9.
點評:三位數(shù)除以兩位數(shù),被除數(shù)百位和十位組成的數(shù)字和除數(shù)比較大小,組成的數(shù)字比除數(shù)大或相等,商就是兩位數(shù),比除數(shù)小,商就是一位數(shù).