3x-y+z=4,2x+3y-z=-31,x+y-z=16三元一次方程组的解急
2019-05-07
3x-y+z=4,2x+3y-z=-31,x+y-z=16三元一次方程组的解
急
优质解答
3x-y+z=4 (1)
2x+3y-z=-31 (2)
x+y-z=16 (3)
(1)+(3) 4x=20 x=5
(1)+(2) 5x+2y=-27 y=-26
z=-37
3x-y+z=4 (1)
2x+3y-z=-31 (2)
x+y-z=16 (3)
(1)+(3) 4x=20 x=5
(1)+(2) 5x+2y=-27 y=-26
z=-37