{4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹
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{4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹
{4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹
{4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹
4x-y+z=25 A ;
6x-z+2y=22 B;
x+3y+z=-2 C;
2A+B,14x+z=72,
3B-2C,16x-5z=70,
86x=430;
X=5,Z=2,y=-3.
1方程+2方程,1方程-3方程。可求出x.y
在1方程×2-2方程,1方程×3+3方程
4x-y+z=25,6x-z+2y=22,x+3y+z=-2
{4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹
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