数学题:11x+3z=8;2x+2y+z=5 ; 2x-6y+4z=-14
问题描述:
数学题:11x+3z=8;2x+2y+z=5 ; 2x-6y+4z=-14
答
2x+2y+z=5×3 6x+6y+3z=15+2x-6y+4z=-148x+7z=18x+7z=1×324x+21z=311x+3z=8×777x+21z=5677x+21z=56-24x+21z=353x=53x=1x=1代入 24x+21z=3 z=-1z=-1代6x+6y+3z=15y=2