x,y,z满足大括号3x+2y-z=7 x-y+2z=6,求6x+4y-2z的值

问题描述:

x,y,z满足大括号3x+2y-z=7 x-y+2z=6,求6x+4y-2z的值

14过程7*2=143x+2y-z=76x+4y-2z=14(*2)