几个平方数相加怎么算?譬如1²+2²+3²……9²简便方法应当怎样算
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几个平方数相加怎么算?譬如1²+2²+3²……9²简便方法应当怎样算
几个平方数相加怎么算?
譬如1²+2²+3²……9²简便方法应当怎样算
几个平方数相加怎么算?譬如1²+2²+3²……9²简便方法应当怎样算
1²+2²+3²……+n²=1/6n(n+1)(2n+1)