刘女士今年48岁,她说:“我有两个女儿,当妹妹长到姐姐现在的年龄时,姐妹俩的年龄之和比我到那时的年龄还大2岁。”问姐姐今
![](images/u2507.png)
刘女士今年48岁,她说:“我有两个女儿,当妹妹长到姐姐现在的年龄时,姐妹俩的年龄之和比我到那时的年龄还大2岁。”问姐姐今年多少岁?
除了列方程,有简便,快速的解题方法吗?
除了列方程,有简便,快速的解题方法吗?
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wangshiweixiou 共回答了18个问题
|采纳率94.4%- 若干年后 姐姐+妹妹的年龄比我的年龄大2岁
前者的组成为 姐姐原来的年龄+妹妹原来的年龄+两份经过的时间
后者为 48+一份经过的时间+2=50+一份经过的时间
也就是说 姐姐原来的年龄+妹妹原来的年龄+一份经过的时间=50
这段时间 妹妹从妹妹原来的年龄变成了妹妹现在的年龄 即 姐姐原来的年龄
也就是 两份姐姐原来的年龄=50
姐姐原来是25岁 即... - 1年前
维洛沙秦 共回答了12个问题
|采纳率83.3%- 年龄问题的解题只需注意两点:一、年龄差永不变,二、年龄倍数随着时间逐渐减少假设姐姐的年龄是A,姐妹的年龄差是B,那么我们可以得到方程:A+A+B=48+B+2,得到A=25,答案是C。
- 1年前
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