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题目计算:1-2+3-4+…+2003-2004=_____. 分析此题若用常规方法计算,极易出错,若使用以下几种解法,则运算过程简捷、明快. 法1 正负配对原式=(1-2)+(3-4)+…+(2003 -2004)
The title calculation: 1-2+3-4+...+2003-2004=_____. If you use the conventional method to analyze this question, it is easy to make mistakes. If you use the following solutions, the calculation process is simple and clear. The method 1 is positive and negative. Pairing primitive = (1-2)+(3-4)+...+(2003 -2004)