已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值
问题描述:
已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值
答
3x+2y+z=315,x+2y+3z=285.两式相加得:4x+4y+4z=600,于是,x+y+z=150.
已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值
3x+2y+z=315,x+2y+3z=285.两式相加得:4x+4y+4z=600,于是,x+y+z=150.