若 x+2y+3z=10,4x+3y+2z=25,则x+y+z=?
问题描述:
若 x+2y+3z=10,4x+3y+2z=25,则x+y+z=?
答
x+2y+3z=10
4x+3y+2z=25
所以:5x+5y+5z=35,x+y+z=7.