当x,y满足----时,2(x+y)/3(x+y)的值为2/3

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当x,y满足----时,2(x+y)/3(x+y)的值为2/3

当x,y满足----时,2(x+y)/3(x+y)的值为2/3
当x,y满足----时,2(x+y)/3(x+y)的值为2/3

当x,y满足----时,2(x+y)/3(x+y)的值为2/3
当x,y满足-x+y≠0 时,2(x+y)/3(x+y)的值为2/3

不等于0时

答案:x≠-y