已知方程组4x+2y-2z=5,2x+3y-z=1,则22x+5y-11z=?
问题描述:
已知方程组4x+2y-2z=5,2x+3y-z=1,则22x+5y-11z=?
等于多少啊?
答
4x+2y-2z=5 (1)
2x+3y-z=1 (2)
(1)×7-(2)×3
28x+14y-14z-6x-9y+3z=35-3
22x+5y-11z=32