解方程组: 5x+4y+z=03x+y−4z=11x+y+z=−2.
问题描述:
解方程组:
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5x+4y+z=0 3x+y−4z=11 x+y+z=−2
答
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...