解方程组x/2-2y=9/2,x-y/2=-9,
问题描述:
解方程组x/2-2y=9/2,x-y/2=-9,
答
x/2-2y=9/2,x-y/2=-9,
x-4y=9
2x-y=-18
y=-36/7
x=-81/7