若3x+5y+6=0,3x+y-7z=0则x+y-z的值等于()
4个回答
首先更正:
3x+5y+6=0应该是3x +5y+ z=0吧!
于是有
3x+5y+z=0 ①
3x+y-7z=0 ②
①+②得
6x+6y-6z=0
两边同时除以6得
x+y-z=0
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