(-2008)0-13-1+|-2|．-数学

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• 下列各式正确的是（）A．-a+b-x+y=a+bx+yB．2m-x+1=2mx-1C．-4-2=-116D．(2-m)0=1-数学
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• 计算：（1）(-1)2011-(3-2)0+(12)-1（2）2a-4a2+6a+9÷a-2a+3•(a+3)．-数学
• Ladies and gentlemen , I have the great privilegeintroducing our speaker for tonight . A．inB．of C．a
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• 计算：(13)-1-5×15+38-数学
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