解下列方程组：(需过程!) 1. 4(x-y-1)=3(1-y)-2 x/2+y/3=2 2.(三元)2x+3y+z=6

解下列方程组：(需过程!) 1. 4(x-y-1)=3(1-y)-2 x/2+y/3=2 2.(三元)2x+3y+z=6 x-y+2z=-1 x+2y-z=5

4(x-y-1)=3(1-y)-2

x/2+y/3=2

(三元)2x+3y+z=6

x-y+2z=-1

x+2y-z=5