若-(a-5)是负数,则a= 5;若-[-(x-y)]是负数,则x+y= 0.(填‘’,或等于 ) 急
问题描述:
若-(a-5)是负数,则a= 5;若-[-(x-y)]是负数,则x+y= 0.(填‘’,或等于 ) 急
答
-(a-5)0
则a>5
-[-(x-y)]