①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程

问题描述:

①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60
三元一次方程

(1)x+y+z=6 ①3x-y+2z=12② x-y-3z=-4 ③①+②4x+3z=18 ④ ②-③2x+5z=16⑤⑤×2 4x+10z=32⑥ ⑥-④7z=14 解得z=2 代入⑤2x+5×2=16解得x=3将x=3 z=2 代入①3+y+2=6解得y=1x=3 y=1 z=2(2)x+y-z=2① 4x-2y+3z+8=0 ②...