三元一次方程,(x-y=1 , x+y+z=26, 2x-y+z=18)需要过程
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/11 06:36:37
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三元一次方程,(x-y=1 , x+y+z=26, 2x-y+z=18)需要过程
三元一次方程,(x-y=1 , x+y+z=26, 2x-y+z=18)需要过程
三元一次方程,(x-y=1 , x+y+z=26, 2x-y+z=18)需要过程
由X-Y=1可以得出:X=Y=1,把X=Y+1代入另外两条方程得出一个二元一次方程:
(Y+1)+Y+Z=26,2(Y+1)-Y+Z=18
解方程得:Y=9,Z=7
再把Y=9代入X=Y+1得出X=10