Me
My name is Li Hua. I am 8 years old. I like sports. I have lots of sports at weekends. I love play table tennis very much, and I like swimming, too. I have a big family. We all like each other.
关于x、y的方程组 3x-y=mx+my=n的解是 x=1y=1,则|m﹣n|的值是( )
读我国某区域图,回答下列问题。