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数学
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计算1-3+5-7+9-11+…+97-99.
人气:237 ℃ 时间:2020-03-11 12:02:40
解答
1-3+5-7+9-11+…+97-99
=(1-3)+(5-7)+(9-11)+…+(97-99)
=-2×
50
2
=-2×25
=-50.
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