已知mn满足方程组m/2+n/3=13 m/3-n/4=3求mn的值
问题描述：
已知mn满足方程组m/2+n/3=13 m/3-n/4=3求mn的值
答
m/2+n/3=13
m/3-n/4=3
3m/2+n=39
4m/3-n=12
3m/2+4m/3=39+12
17m/6=51
m=18
n=12