解三元一次方程 x+y-2z=1 3x+y+z=0 2x-y+3z=1
问题描述:
解三元一次方程 x+y-2z=1 3x+y+z=0 2x-y+3z=1
答
x+y-2z=1(1)3x+y+z=0 (2)2x-y+3z=1 (3)(2)-(1)3x+z-x=2z=-12x+3z=-1 (4)(1)+(3)3x+z=2 (5)(4)-(5)x32x-9x=-1-6-7x=-7x=13x+z=2z=-1x+y-2z=11+y+2=1y=-2所以x=1 ,y=-2 ,z=-1希望...