论文部分内容阅读
近几年的中考试题,设计新颖、贴近生活、反映时代气息的开放探索题和阅读理解题不断出现,这类问题往往需要学生运用已学过的数学知识去观察或实践,归纳与猜想出一定的结论,才能确定解题方向,理出解题思路,达到解决问题的目的,现举例如下:例1你能很快算出19952吗?为了解决这个问题,我们考察个位上数字为5的自然数的平方,任意一个个位数为5的自然数可写为10n+5,它的平方即(10n+5)2(n为自然数,试分析n=1,n=2,n=3……
In the mid-term examination questions in recent years, open-ended exploration questions and reading comprehension questions that are novel in design, close to life, and reflect the atmosphere of the times continue to emerge. Such problems often require students to use the learned mathematics knowledge to observe or practice, and to sum up and guess certain In order to solve this problem, we examine natural numbers with a number of 5 in order to solve this problem. The square of any natural number with a single digit of 5 can be written as 10n+5, and its square is (10n+5)2 (n is a natural number, test analysis n=1, n=2, n=3...