x+2y+3z=6 4x+5y+6z=0 7x+8y+9z=-6求解

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x+2y+3z=6 4x+5y+6z=0 7x+8y+9z=-6求解
x+2y+3z=6 4x+5y+6z=0 7x+8y+9z=-6求解

x+2y+3z=6 4x+5y+6z=0 7x+8y+9z=-6求解
x+2y+z=6(1)
4x+5y+6z=0(2)
7x+8y+9z=-6(3)
(1）*4-（2）：3y-2z=24(3)
(1)*7-(3)::6y-2z=48(4)
(4)-(3),3y=24
y=8(5)
把（5）式代入（3）式得：3*8-2z=24
z=0(6)
把（5）式和（6）式代入（1）式得：x+2*8+0=6
x=-10
所以：x=-10,y=8,z=0

x=-6
y=0
z=4

x+2y+3z=6
4x+5y+6z=0 , 3y+6z=24,
x=-8, y=4, z=2

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