1.x-y-z=1 2x+y-3z=4 3x-2y-z=-1 2.a+0.5b=c 0.5a-b-c=1 3a+b=-21.x-y_其他解答

1.x-y-z=1 2x+y-3z=4 3x-2y-z=-1 2.a+0.5b=c 0.5a-b-c=1 3a+b=-2
1.
x-y-z=1
2x+y-3z=4
3x-2y-z=-1
2.
a+0.5b=c
0.5a-b-c=1
3a+b=-2

人气：217 ℃　时间：2020-04-09 09:10:41

解答

1.x-y-z=1.① ⑥ ⑦2x+y-3z=4..②3x-2y-z=-1.③③-①2x-y=-2④③*3-②7x-7y=-7,x-y=-1⑤④-⑤x=-1,y=0.代入①z=-2x=-1y=0z=-2 2.a+0.5b=c①0.5a-b-c=1②3a+b=-2 ③②-① ...