求二道预初数学的三元一次方程组(要快啊!)一:(大括号){x+y=0 二:(大括号){x+y= -14{y+z= -1 {y+z= -7{z+x=-1 {z+x=9
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![求二道预初数学的三元一次方程组(要快啊!)一:(大括号){x+y=0 二:(大括号){x+y= -14{y+z= -1 {y+z= -7{z+x=-1 {z+x=9](/uploads/image/z/3632997-21-7.jpg?t=%E6%B1%82%E4%BA%8C%E9%81%93%E9%A2%84%E5%88%9D%E6%95%B0%E5%AD%A6%E7%9A%84%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%28%E8%A6%81%E5%BF%AB%E5%95%8A%21%EF%BC%89%E4%B8%80%EF%BC%9A%28%E5%A4%A7%E6%8B%AC%E5%8F%B7%EF%BC%89%7Bx%2By%3D0+%E4%BA%8C%EF%BC%9A%28%E5%A4%A7%E6%8B%AC%E5%8F%B7%EF%BC%89%7Bx%2By%3D+-14%7By%2Bz%3D+-1+%7By%2Bz%3D+-7%7Bz%2Bx%3D-1+%7Bz%2Bx%3D9)
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求二道预初数学的三元一次方程组(要快啊!)一:(大括号){x+y=0 二:(大括号){x+y= -14{y+z= -1 {y+z= -7{z+x=-1 {z+x=9
求二道预初数学的三元一次方程组(要快啊!)
一:(大括号){x+y=0 二:(大括号){x+y= -14
{y+z= -1 {y+z= -7
{z+x=-1 {z+x=9
求二道预初数学的三元一次方程组(要快啊!)一:(大括号){x+y=0 二:(大括号){x+y= -14{y+z= -1 {y+z= -7{z+x=-1 {z+x=9
一:x+y=0 (1)
{y+z= -1 (2)
{z+x=-1 (3)
(1)+(2)+(3)得
2(x+y+z)=-2
x+y+z=-1 (4)
(4)-(1)得 z=-1
(4)-(2)得 x=0
(4)-(3)得 y=0
二:(x+y= -14 (1)
{y+z= -7 (2)
{z+x=9 (3)
(1)+(2)+(3)得
2(x+y+z)=-12
x+y+z=-6 (4)
(4)-(1)得 z=8
(4)-(2)得 x=1
(4)-(3)得 y=-15