已知3X+2X+Z=315,X+2Y+3Z=285,求X+Y+Z的值
问题描述:
已知3X+2X+Z=315,X+2Y+3Z=285,求X+Y+Z的值
答
3X+2X+Z=315,
X+2Y+3Z=285
两式相加得
4(X+Y+Z)=600
X+Y+Z=150