|x-y |=x-y |x |=1999 |y |2000,求x+y的值

分类: 作业答案 • 2022-01-09 18:04:21

问题描述：

|x-y |=x-y |x |=1999 |y |2000,求x+y的值
|x-y |=x-y |x |=1999 |y |=2000，求x+y的值

答

|x-y |=x-y >0
x>y
又|x |=1999 |y |=2000
x=-1999,y=-2000
x+y=-3999