1-2+3+4-5+6+7-8+9+10-11+12+…+94-95+96+97-98+99.
人气:400 ℃ 时间:2020-03-19 20:10:32
解答
1-2+3+4-5+6+7-8+9+10-11+12+…+94-95+96+97-98+99,=(1+4+7+…+97)+[(3-2)+(6-5)+(9-8)+(12-11)+…+(96-95)+(99-98)],=(1+97)×[(97-1)÷3+1]÷2+1×32,=98×33+32,=3234+32,=3266....
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