x+y+z＝−53x+y+z＝14x+3y+2z＝−2.

x+y−2z＝52x−y+z＝42x+y−3z＝10 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 已知x−y+z＝0x+2y−3z＝0 己知x，y，z，t满足方程组x+y+z＝62x−z+t＝−2 已知x+y−5z＝03x−3y−z＝0 已知x−3y+z＝03x+3y−4z＝0 解方程组：x−43＝y+14＝z+25x−2y+3z＝30 x+2y+3z＝12x+3y+z＝23x+y+2z＝3 2x+y+3z＝383x+2y+4z＝564x+y+5z＝66 若x+2y-4z＝0 3x+y-z＝0 求x：y：z 解方程组：x−y−z＝0x+y−3z＝42x+3y−5z＝14 解方程组：3x+2y+5z＝2x−2y−z＝64x+2y−7z＝30.