方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
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方程组(1)x+2y-3z=12x-3y+2z=-13x-y-z=0(2)x+y=z5x-y+z=182x+5y+3z=-1方程组(1)x+2y-3z=12x-3y+2z=-13x-y-z=0(2)x
方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1
(1) x+2y-3z=12
x-3y+2z=-13
x-y-z=0
2y-2z=10 -2y+3z=-13
z=-3 y=2 x=-1
(2) x+ y-z =0
5x-y+z=18
2x+5y+3z= -1
6x=18
x=3
y-z=-3 3y-3z=-9
5y+3z=-7
y=-2 z=1 x=3
1> x=-1 y=2 z=-3
2> x=3 y=-2 z=1
解方程组:x:y:z=1:2:3;x+y+z=12,求,x,y,z的值
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