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上海智康1对1 小学奥数 团队 第1讲计算一、知识点概述①凑整法②分组法关键:几个数一组,每一组一定是特殊的 例如0,1或分别为1,2,3……等③等差数列和=(首项+末项)×项数÷2项数=(末项-首项)÷公差+1末项=首项+(项数-1)×公差④位值原理任一个数,不同数位上的数字表示的意义是不一样的,如一个四位数可以表示为:⑤特殊数求和轮转数:二、例题精讲【例1】(1)1+2-3-4+5+6-7-8
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进位制与位值原理 n进制化10进制?把下列各数转化成十进制数: ⑴(1110101)2; ⑵(463)810进制化n进制?将(2009)10写成二进制数n进制中的计算1.(101)2×(1011)2-(11011)2=________;2.(11000111)2-(10101)2÷(11)2=()2; 3.(3021)4+(605)7=()10; 4.(63121)8-(1247)8-(1603
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