解{x-2y=0{5x-7y-2=0
问题描述:
解{x-2y=0{5x-7y-2=0
答
X=4/3,Y=2/3
答
x=4/3
y=2/3
x=2y代入5x-7y-2=3y-2=0
故y=2/3