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2012年10月16日 · x=-5时，-5+2=-3<0 -5-2=-7<0，均满足题意。 已知|x|=5,|y|=2,且x+y<0,则x-y的值等于已知|x|=5,|y|=2所以x=±5 y=±2且x+y<0所以有两种情况：第一种：x=-5，y=-2x-y=-5-（ …