If I give you seven apples, you will have five times as many as I would then have.
问题描述：
If I give you seven apples, you will have five times as many as I would then have.
However, if you give me seven apples, we will then both have the same number of apples. How many apples do I currently have?
求算式
答
如果我给你七个苹果,你的苹果数量是我的五倍.然而,如果你给我七个苹果,我们的苹果数量相同.请问现在我们各有几个苹果?
假设我的苹果数量是X,你的苹果数量是Y,根据给出的提示,可以写出下面两个方程式：
Y+7=5*（X-7）
Y-7=X+7
X=14
Y=28
也就是说,我现在有14个苹果,你现在有28个苹果.好棒谢谢，可是可以用2元一次（不好意思不会写）方程吗这个就是二元一次方程啊。所谓二元一次方程，就是有两个未知数，x和y,两个未知数的次数都是一次。