赵嘉颖同学对付方程组中的“第三者”颇有心得,一起欣赏吧.一天,我遇到了方程组中的“第三者”:若关x,y的二元一次方程组{x+y=5k,x-y=9k的解也是二元一次方程2x+3y=6的一个解,则k的值为____.习惯了二元一次方程组中的未知数是x,y,这儿却冒出来第三个未知数k,怎么办?仔细观察发现,这个方程组特别熟悉,这不是老师一直说的把两个方程加一加,减一减的类型吗?把两个方程相加得x=7k,把两 Zhao Jiaying students to deal with equations in the “third party ” quite experience, enjoy it together .One day, I met the “third party” in the system of equations: if x, y of the binary system of equations The solution of {x + y = 5k, xy = 9k is also a solution of the binary equation 2x + 3y = 6, then the value of k is ____. It is customary that the unknowns in the binary system of equations are x, y, But emerge the third unknown k, how to do? Careful observation found that this equation is particularly familiar with the group, this is not the teacher has said that the two equations plus one plus, minus one minus the type? Add two equations Get x = 7k, put two