X=Y+Z(1),X-Y-2Z=1(2),X-2Y-Z=-2(3),把(1)代入(2),(3),可得方程组( )从而把三
一、用代入法解下列方程组 1、{x+y+z=2,3x-y-4z=5 ,2x+3y-2z=0}
用代入法解下列方程组 1、{x+y+z=2,3x-y-4z=5 ,2x+3y-2z=0}
解下列方程组(1)3x-y+z=3 2x+y-3z=11 x+y+z=12(2)5x-4y+4z=13 2x+7y-3z
用代入法解方程组:2x+y+z=-1 ,3y-z=-1 ,3x+2y+3z=-5
解三元一次方程组(1)x+y+z=2 (2)x-y+z=4 (3)2x+y-z=2
三元一次方程组:(1)2X+3Y+Z=6 (2)X-Y+2Z=-1 (3)X+2Y-Z=5
解下列方程组(1){x+y-z=-3,2x+y-3z=-2,3x-y+2z=-11
已知方程组{3x+7y+z=3(1) 4x+10y+z=4(2)求x+y+z的值
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
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
解下列方程组: (1)(3x-y+z=10 (x+2y-z=6 (x+y+z=12 (2)(2x+4y+3z=9(3x-