x+2y-z=3 -x-3y+2z=-4 3x+y-z=10
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x+2y-z=3 -x-3y+2z=-4 3x+y-z=10
x+2y-z=3 -x-3y+2z=-4 3x+y-z=10
x+2y-z=3 -x-3y+2z=-4 3x+y-z=10
x+2y-z=3 ( 1 ) -x-3y+2z=-4 ( 2 ) 3x+y-z=10 ( 3 )
(3)-(1) 2x-y=7(4)
(1)*2+(2) x+y=2(5)
(4)+(5) x=3
将x=3带入(4) y=-1
将 x=3 y=-1带入(1) z=-2
∴ x=3 y=-1 z=-2
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y-z=3 -x-3y+2z=-4 3x+y-z=10
x/2=y/3=z/4则2x+y-z/3x一2y+Z
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