三员一次方程组X+Y+Z=35 2X-Y=5 1/3Y=1/2Z
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
解三元一次方程组x:y:z=1:2:3 x+y+z=36
三元一次方程组数学题x+2y+2z=33x+y-2z=72x+3y-2z=10x-y=2z-x=3y+z=-1x-y-z
解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-
解三元一次方程组x:y=2:1,2x-y=3z,x+y+z=20
解三元一次方程组1)2x+y-3z=3,3x-y+2z=1,x-y-z=5 2)x:y=3:2,y:z=5:4,x+y+
解三元一次方程组:(1)x+2y+3z=11x-y+4z=10x+3y+2z=2(2)x:y=3:5y:z=5:6x+y
解三元一次方程组 5x+2y-4z=1,3x-3y+2z=1,-2x+3y-2z=0
解三元一次方程组:5x+y+z=1(1) 2x-y+2z=1(2) x+5y-z=-4(3) 急
三元一次方程组:2X+Y-Z=5---(1) X-Y+2Z=-1---(2) X+2Y+Z=-2---(3)
三元一次方程组:(1)2X+3Y+Z=6 (2)X-Y+2Z=-1 (3)X+2Y-Z=5
三元一次方程组: z=x+y (1) 3x-2y-2z=-5 (2) 2x+y-z=3 (3) 怎么解