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負數.理由如下:由圖可知,b<0,a<0,且|a|>|b|>0,有a-b<0,a+b<0.根據絕對值的意義,得:|a-b|=b-a,|a+b|=-(a+b),∴原式=(b-a)+(a+b)=b-a+a+b=2b<0,所以|a-b|-|a+b|是負數.
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