x-y+4z=10,x+3y+2z=2,x+2y+3z=11.

问题描述:

x-y+4z=10,x+3y+2z=2,x+2y+3z=11.

x-y+4z=10 (1)x+3y+2z=2 (2)x+2y+3z=11 (3)(2)-(1):4y-2z =-8 ,即 2y -z =-4 (4)(3)-(1):3y -z =1 (5)(5)-(4):y = 5 代入 (5):z = 14将 y、z代入 (1):x=-41答案:(x,y,z) = (-41,5,14)...