5,若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为( )

问题描述:

5,若x+2y+3z=10,4x+3y+2z=15,则x+y+z的值为( )
A.2 B,3 C,4 D,5

把二者x+2y+3z=10,4x+3y+2z=15加起来是:5x+5y+5z=25
5(x+y+z)=25
x+y+z=5