解个3元一次方程组 y+2z=12x-3y-4z=-33x-2z=5(要写过程啊,按格式)x+y+z=15.55x+5.
解2个3元一次方程组 1:{x+y+z=4 {2x-y+z=3 {3x+2y-z+18 2:{5x-4y+4z=13 {
求三元一次方程组的解有过程 x-y-z=1 3x+5y+7z=11 4x-y+2z=-1
解三元一次方程组:x+y+z=6,y-z=4,x-y-2z=3,
解二元一次方程组X:Y:Z=1:2:3,X+Y+Z=12
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
解3元一次方程组:x+y+z=70 x/30+y/20+z/40=2/5 x/40+y/20+z/30=10/23
解三元一次方程组:(要有过程){x+y-z=0,x+2y+z=13,2x-3y+2z=5
解三元一次方程组:{x+y+z=4 2x+y+3z=9 x+3y+2z=14 {3x+y-z=7 x+2y+2z=12
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-
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