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](/uploads/image/z/15856214-14-4.jpg?t=x%2B2y%2B3z%3D6+4x%2B5y%2B6z%3D0+7x%2B8y%2B9z%3D-6%E6%B1%82%E8%A7%A3)
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
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
求解三元一次方程组{2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13}
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