79쪽1. 1)x=-1,y=6/2)x=2,y=0,3)x=-1,y=2///2. 4/3.4/4.-8/5. a=3/6. -10///80쪽 1.1) -/2)-/3) +//2. x=2,y=0//2)x=0,y=-2//3.1)2x-3y=6/2)3x+10y=8/3)x-y=-18
당신은 어느 그룹입니까?