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来源：学生作业帮编辑：拍题作业网作业帮分类：综合作业时间：2024/05/01 11:13:31

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由条件2X+Y+3Z=23,X+4Y+5Z=36,能求出X+2Y+3Z的值吗?（已知X-2Y=5,Y-2Z=1/2,）最好不要用括号里的条件,不行的话再用.

由2X+Y+3Z=23得4X+2Y+6Z=46,式一；
由X+4Y+5Z=36得3X+12Y+15Z=108式二.
式一+式二=（4X+2Y+6Z）+（3X+12Y+15Z）=7X+14Y+21Z=7(X+2Y+3Z)=46+108=154；
得X+2Y+3Z=22.

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