4x+3z=9 2x-6y+4z=5 3x+2y+z=8

问题描述:

4x+3z=9 2x-6y+4z=5 3x+2y+z=8
4x+3z=9 2x-6y+4z=5 3x+2y+z=8

4x+3z=9 (1)2x-6y+4z=5 (2)3x+2y+z=8 (3)(3)*3+(2)得11x+7z=29 (4)(4)*3-(1)*7得5x=87-63=24x=24/5代入(1)3z=9-4*24/5z=3-32/5=-17/5代入(2)6y=5-2*24/5+4*17/5=(25+68-48)/5=9y=3/2...