已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值

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已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z

已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值
已知3X+2Y+Z=315,X+2Y+3Z=285,求X+Y+Z的值

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.