21+25+29.+97+101简便方法怎么算?
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![21+25+29.+97+101简便方法怎么算?](/uploads/image/z/189804-12-4.jpg?t=21%2B25%2B29.%2B97%2B101%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E6%80%8E%E4%B9%88%E7%AE%97%3F)
21+25+29.+97+101简便方法怎么算?
21+25+29.+97+101简便方法怎么算?
21+25+29.+97+101简便方法怎么算?
21+25+29+……+97+101
=(21+101)+(25+97)+(29+93)+……
=122+122+122+……
=122×[(101-21)÷4+1]÷2
=122×21÷2
=21×122÷2
=21×61
=(20+1)×61
=20×61+1×61
=1220+61
=1281
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