7x+2y-z=7 9x+4y+z=10 5x-3y+6z=-3

若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 3x+7y+z=5 ,4x+10y+z=6 ,x+y+z= 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X 解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y 已知3X+7Y+Z=6 4X+10Y+z=7 求X+Y+Z=? 若3x+7y+z=5,4x+10y+z=3,则x+y+z=? {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2