3x-4y+3z=4 2x-2y+3z=5 x+4y-5z=6

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/07/17 19:23:36

3x-4y+3z=4①
2x-2y+3z=5②
x+4y-5z=6③

由③得x=6+5z-4y代入①②得
9z-8y+7=0
13z-10y+7=0

解方程组得y=2,z=1
所以x=6+5z-4y=6+5-8=3

即方程组的解是x=3,y=2,z=1

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