4、2x+2y+2z=24 4x+3y+2z=32 5x+4y+2z=38
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4、2x+2y+2z=24 4x+3y+2z=32 5x+4y+2z=38
4、2x+2y+2z=24 4x+3y+2z=32 5x+4y+2z=38
4、2x+2y+2z=24 4x+3y+2z=32 5x+4y+2z=38
2x+2y+2z=24……①
4x+3y+2z=32……②
5x+4y+2z=38……③
②-1得
2x+y=8……④
③-②得
x+y=6……⑤
④-⑤得
x=2
所以 y=4
所以 z=6
X=2 Y=4 Z=6
x=2 y=4 z=6
2x+2y+2z=24……(1)
4x+3y+2z=32 ……(2)
5x+4y+2z=38……(3)
(2)-(1)2x+y=8……(4)
(3)-(1) 3x+2y=14 ……(5)
(4)×2-(5)x=2
y=4
z=12-4-2=6
∴x=2
y=4
z=6
2x+2y+2z=24(1)
4x+3y+2z=32(2)
5x+4y+2z=38(3)
(3)-(2)得出
x+y=6(4)
把(4)代入(1)得出
2*6+2z=24 ,z=6
由此 x=2 y=4
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