Question

求解简单的三元一次方程组!0.98x- y - z >= 0-x + 3.13y - z >= 0-x - y + 7.

Answer 1

①-②,②X7.8+③,得：

1.98X-4.13Y=0.④

-8.8X+23.414Y=-18.76 .⑤

X=4.13Y/1.98 带入⑤

Y=-18.76X1.98/(23.414-4.13X8.8)

X=4.13X18.76X1.98/1.98X(8.8x4.13-23.414)=4.13x18.76/(8.8x4.13-23.414)

z=0.98x4.13x18.76/(8.8x4.13-23.414)+18.76X1.98/(23.414-4.13X8.8)