x+y-z=0 .1
x+2y-z=3 .2
2x-3y+2z=5.3
2式-1式得
y=3.4
1式*2+3式得
4x-y=5.5
将4式代入5式得
4x-3=5
4x=8
x=2.6
将4式,5式代入1式得
2+3-z=0
5-z=0
z=5
所以x=2,y=3,z=5