已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=1”改成“5x-6y+7z=0”

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已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=1”改成“5x-6y+7z=0”已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=

已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=1”改成“5x-6y+7z=0”
已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?
把“5z-6y+7z=1”改成“5x-6y+7z=0”

已知x+2y-3z=0,5x-6y+7z=1;则x:y:z=?把“5z-6y+7z=1”改成“5x-6y+7z=0”
答案:2:11:8
--------------过程--------------
首先:x+2y-3z=0 5x-6y+7z=0
然后:变形为 5X+10Y-3Z=0(1式) 5X-6Y+7Z=0(2式)
1式-2式:16Y-22Z=O Y=11Z/8
3X+6Y-9Z=0 (3式)
5X-6Y+7Z=0(4式)
3式+4式:8X-2Z=0 X=Z/4
最后:X:Y:Z=Z/4:11Z/8:Z=2:11:8