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48-3+12.-数学
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阅读下面问题:12+1=2-1,13+2=3-2,14+3=4-3,15+4=5-4,…从计算结果中找出规律,再利用这一规律计算下列式子的值:(12+1+13+2+14+3+…+12002+2001)
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计算:12+3+27-613=______.-数学
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计算:8-613+434-212.-数学
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