年龄问题的解题技巧

• 作 者: 蔚永生
• 机 构: 山西太原市太钢六校,
• 出 处: 小学教学设计
• 发表日期: 2006年29期
• 关键词: 年龄问题 和差问题 解题技巧 和倍问题 李大爷 差倍问题 父子俩 姐弟俩 就是你 小梅

一、用和差问题的方法解答年龄问题例1.姐弟俩人的年龄之和是25岁,四年后,姐姐比弟弟大5岁。今年姐弟各多少岁?【分析与解】这一题是年龄问题和和差问题的结合。在年龄问题中,年龄差是不变的。“四年后,姐姐比弟弟大5岁”,也就是今年姐姐比弟弟大5岁,这是告诉我们差“;姐弟俩人

First, the use of and poor problem-solving method to answer the age example 1. Sister and brother both age is 25 years old, four years later, older sister older brother than five years old. This year’s elder sister how old? [Analytical solution] This question is the combination of age and poor issues. In the age problem, the age difference is unchanged. “Four years later, my sister is 5 years older than my younger brother,” which means that my sister is 5 years older than my younger brother this year. This is telling us that "the two brothers and sisters