{x+y=2+z 2y-3z=1 3y-2x=4}
问题描述:
{x+y=2+z 2y-3z=1 3y-2x=4}
答
x+y=2+z ①
2y-3z=1 ②
3y-2x=4 ③
由③得:x=3y/2-2④
由②得:z=2y/3-1/3⑤
把④、⑤代入①,得:3y/2-2+y=2+2y/3-1/3,9y-12+6y=12+4y-2,11y=22,y=2;
x=3y/2-2=1; z=2y/3-1/3=1
x=1
y=2
z=1