x+y+z=42x+y+z=33x-2y-3z=-5
问题描述:
x+y+z=42x+y+z=33x-2y-3z=-5
答
x+y+z=4----(1)
2x+y+z=3----(2)
3x-2y-3z=-5----(3)
(2)-(1),x=-1,
把x=-1代入(2)(3)中得:
y+z=5----(4)
2y+3z=2----(5)
(5)-(4)×2,z=-8
y-8=5,y=13.