解方程组: 5x+4y+z=03x+y−4z=11x+y+z=−2.

问题描述:

解方程组:

5x+4y+z=0
3x+y−4z=11
x+y+z=−2

5x+4y+z=0  ①3x+y−4z=11 ②x+y+z=−2    ③,②-③,2x-5z=13   ④,③×4-①,4x+4y+4z-5x-4y-z=-2×4,        &nbs...