x+y+z=24 x+x+y=23 x+y-z=6 求x=?y=?z=?
1个回答
(1)x+y+z=24 (2)x+x+y=23 (3)x+y-z=6
(1)+(3)得
(4)x+y=15
(2)-(4)得 X=8
带入(4)得Y=7
带入(1)得Z=9
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X+Y=23 X=Y+Z Z=X-3 X=?Y=?Z=?
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