Question

三元一次方程求解答马上采纳!2X+3Y-4Z=24 X+2Z=-4 Z-X-2Y=6

Answer 1

2X+3Y-4Z=24 ①

X+2Z=-4 ②

Z-X-2Y=6 ③

①×2得4x+6y-8z=48 ④

③×3得3z-3x-6y=18 ⑤

④+⑤得x-5z=66 ⑥

②-⑥得7z=-70

z=1

把z=1得②得x+2=-4

x=-6

把x=-6、z=-1代入③得-6+2-2y=6

y=-5