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若|m+n|=|m|+|n|,则m,n满足的条件是( );若|m-n|=|m|+|n|,则m,n满足的条件是( );若|m+n|=|m|-|n|,则m,n满足的条件是( );若|m-n|=|m|-|n|,则m,n满足的条件是( ).

分类: 作业答案 • 2022-07-19 18:43:51

问题描述：

若|m+n|=|m|+|n|,则m,n满足的条件是( );若|m-n|=|m|+|n|,则m,n满足的条件是( );若|m+n|=|m|-|n|,则m,n满足的条件是( );若|m-n|=|m|-|n|,则m,n满足的条件是( ).

答

mn≥0
m≥0,n≤0
mn≤0且|m|>|n|有四个空诶 ......额第四题没看到，是 mn>0且|m|>|n|