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列方程解应用题是解决问题中常用的一个重要的方法。【例1】兄弟二人三年后的年龄和是26岁,弟弟今年的年龄恰好是兄弟二人年龄差的2倍,问三年后兄弟二人各几岁?分析与解设三年后哥哥年龄是x岁,因为兄弟二人三年后年龄和是26岁,则三年后弟弟年龄为(26-x)岁,那么,哥哥今年年龄就是(x-3)岁,弟弟今年年龄为(26-x-3)岁。注意到兄弟二人的年龄差始终不变,也
Column equation solution application problem is commonly used in solving an important method. [Example 1] Two brothers three years after the age of 26 years old, younger brother this year is exactly two times the age difference of two brothers, asked three years after the brothers two years old? Analysis and solution set three years later My brother is x years old, because the brothers are three years later and are 26 years old. After three years, the younger brother is (26-x) years old. Then his brother is (x-3) years old this year and his younger brother is (26-x-3) years old. Note that the age difference between two brothers is always the same, too