解三元一次方程（只写答案）急!1（1）x-2y=-9y-z=32z+x=47(2)3x-y+z=42x+3y-z=12x+y+z=6(3)y=2x-75x+3y+2z=23x-4z=4(4)4x+9y=123y-2z=17x+5z=19/4(5)4x-9z=173x+y+15z=18x+2y+3z=2(6)2x+4y+3z=93x-2y+5z=115x-6y+7z=13(7)x/y=3/2y/z=5/4x

Question

解三元一次方程（只写答案）急!1
（1）x-2y=-9 y-z=3 2z+x=47
(2)3x-y+z=4 2x+3y-z=12 x+y+z=6
(3)y=2x-7 5x+3y+2z=2 3x-4z=4
(4)4x+9y=12 3y-2z=1 7x+5z=19/4
(5)4x-9z=17 3x+y+15z=18 x+2y+3z=2
(6)2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13
(7)x/y=3/2 y/z=5/4 x+y+z=66
(8)3x-y+z=3 2x+y-3z=11 x+y+z=12
(9)5x-4y+4z=13 2x+7y-3z=19 3x+2y-z=18

Answer 1

(1)x=22,y=31/2,z=25/2
(2)x=2,y=3,z=1
(3)x=2,y=-3,z=1/2
(4)x=3/4,y=5/3,z=2
(5)x=5,y=-2,z=1/3
(6)x=-1,y=1/2,z=3
(7)x=30,y=20,z=12
(8)x=29/9,y=139/18,z=19/18
(9)x=5,y=0,z=-3
累死了,加点分吧.