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答: |a|=5,a=-5或者5 |b|+4,b=-4或者4 |a+b|=a+b>=0 所以:a=5,b=-4或者4 所以: a-b=5-(-4)=9 或者:a-b=5-4=1 所以:a-b=9或者a-b=1
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