解下列三元一次方程组(1).x+z-3=0,2x-y+2x=2,x-y-z=-3 (2)2x+y
=4x+3z=1,x+y+z=7(3)x:y=1:5,y:z=2:3,x+y+z=27(4)x/2-y/3-z/4=3,x/2+y/3-z=4,x/3-y/2+z/2=3...
=4x+3z=1,x+y+z=7(3)x:y=1:5,y:z=2:3,x+y+z=27(4)x/2-y/3-z/4=3,x/2+y/3-z=4,x/3-y/2+z/2=3
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