2x+y+z=4 .(1)
x+2y+z=8 .(2)
x+y+2Z=24.(3)
(1)+(2)+(3)得
4x+4y+4z=36
x+y+z=9.(4)
(1)-(4)得
x=-5
(2)-(4)得
y=-1
(3)-(4)得
z=15
解得
x=-5
y=-1
z=15
3元一次方程2x+y+z=4 x+2y+z=8 x+y+2Z=24
1个回答
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