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数学
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199-197+195-193+191-189+.+7-5+3-1
人气:429 ℃ 时间:2020-03-28 04:18:00
解答
199-197+195-193+…+3-1 =(199-197)+(195-193)+…+(3-1) =2*[(197-1)/4+1] =2*50 =100 每两项相结合,都为2,算出一,
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1+3+5+7+9+……+191+193+195+197+199的结果是‘
199+197-195+193-191+……+5-3+1
1+3+5+7+9+...+191+193+195+197+199的结果是多少,算式要列出来,
-1+3-5+7-9+11-...-193+195-197+199=?
199-197+195-193+…+3-1
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