2x+2y+3z=10且x+3y+5z=1 求2z+y-x的值
问题描述:
2x+2y+3z=10且x+3y+5z=1 求2z+y-x的值
答
x+3y+5z-(2x+2y+3z)=1-10
x+3y+5z-2x-2y-3z=-9
2z+y-x=-9