X+Y+Z=26 X-Y=1 2X-Y+Z=18这三个为三元一次方程组,求如何解,要用加减消元法或其他方法!
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X+Y+Z=26 X-Y=1 2X-Y+Z=18这三个为三元一次方程组,求如何解,要用加减消元法或其他方法!
X+Y+Z=26 X-Y=1 2X-Y+Z=18这三个为三元一次方程组,求如何解,要用加减消元法或其他方法!
X+Y+Z=26 X-Y=1 2X-Y+Z=18这三个为三元一次方程组,求如何解,要用加减消元法或其他方法!
你好
解
X+Y+Z=26 (1)
X-Y=1 (2)
2X-Y+Z=18 (3)
(1)-(3)
-X+2Y=8 (4)
(4)+(2)
Y=9
把 Y=9代入(2)解得
X=10
代入(1)
9+10+Z=26
Z= 7
方程的解为
{X=10
Y=9
Z= 7
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