2x+y=2,x+2y=5,x-y+2z=-7三元一次方程
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2x+y=2,x+2y=5,x-y+2z=-7三元一次方程
2x+y=2,x+2y=5,x-y+2z=-7
三元一次方程
2x+y=2,x+2y=5,x-y+2z=-7三元一次方程
(1)×2-(2)得
3x=-1
∴x=-1/3
把x=-1/3代入(1)得
-2/3+y=2
∴y=8/3
把x=-1/3,y=8/3代入(3)得
-1/3-8/3+2z=7
∴2z=10
z=5
∴方程组的解是
x=-1/3
y=8/3
z=5
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