求,初二数学书上册P164 1,2,4,5,6,7,
问题描述：
求,初二数学书上册P164 1,2,4,5,6,7,
答
1.c 2.x=5,y=5;x=2,y=7;x=5/8,y=-8/9;x=-11/13,y=-23/13 3.x=2,y=2 4.a=5,b=2 5.x-y=-1,2x-y=1 7.x+y=-2,2x-y=-8
求,初二数学书上册P164 1,2,4,5,6,7,
1.c 2.x=5,y=5;x=2,y=7;x=5/8,y=-8/9;x=-11/13,y=-23/13 3.x=2,y=2 4.a=5,b=2 5.x-y=-1,2x-y=1 7.x+y=-2,2x-y=-8