论文部分内容阅读
上海一师附小的操场旁,放着一块黑板,吸引着无数孩子前去抄写、思索、讨论。原来,黑板上写着三组趣味数学测验题: 第一组:(五年级) 一、有十箱产品,每箱内有100个产品零件,按标准每个零件重1斤,现有一箱是次品,每个重0.9斤,而外表和正品不能区分,现有一杆秤,只用一次,能否找到哪一箱是次品。二、53□□,请你填上任一个数,组成既能被4整除,又能被9除余5的四位数。这样的四位数有几个,请全部写出。
Next to a small playground in Shanghai, there stood a blackboard that attracted countless children to copy, think and discuss. It turned out that the blackboard read three sets of interesting mathematical test questions: The first group: (fifth grade) First, there are ten boxes of products, each box has 100 product parts, according to the standard weight of each part 1 kg, the existing box is Negatives, each weighing 0.9 kg, and the appearance of genuine can not be distinguished, the existing scale, only once, can find which box is defective. 53. □ □, please fill in any number to form a four-digit number that can be divided by 4 and by 9. There are a few such four digits, please write all.