100-99为一组=1
98-97为一组=1
以此类推
2-1为一组=1
一共50组,答案为50
用简便的方法算出：100-99+98-97+.+4-3+2-1
用简便的方法算出：100-99+98-97+.+4-3+2-1
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数学人气：865 ℃时间：2019-10-19 19:03:00
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