若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于【】
问题描述:
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于【】
答
3x+5y+6z=5,4x+2y+z=2
将以上两式相加得:
7x+7y+7z=7
所以x+y+z=1明白了!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!不客气:)