3X+4Y+Z=100 X+Y+Z=7怎么解

x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x-4y+z=-302x+y-z=18x--y-z=7 14x+4y+z=200,x+y+z=100求解x,y,z x+y/2=z+x/3=y+z/4 x+y+z=27 x+2y=3x+2z=4y+z 求x:y:z 3X+4Y+Z=100 X+Y+Z=7怎么解 (x+y-z)(x-y+z)= fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 x,y,z不是0.3z=4y,z=3x求（x+y）：（x+z）. 解方程：{2x+3y+z=7,x+y+z=4,3x+y-z=-4{2x+3y+z=7,x+y+z=4,3x+y-z=-4要过程 解下列三元一次方程组 1. x-4y+z=-3 2x+y-z=18 x-y-z=7 2. x:y:z=2:3:5 x+y+z=100 要过程 谢谢 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? x：y：z=3:4:7 2x-3y+z=18 求：3x-2y+z X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 3x+7y+4z=35,x+5y+2z=40,x+y+z=( ) {x+y+z=1 {x+3y+7z=2 {x+5y+19z=4 x+2y+4z=17 2x+y+z=7 3x+y+2z=11