试求1²,2²,3²,4²,...,2005²,2006²的和的个位数字.
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![试求1²,2²,3²,4²,...,2005²,2006²的和的个位数字.](/uploads/image/z/654298-34-8.jpg?t=%E8%AF%95%E6%B1%821%26%23178%3B%2C2%26%23178%3B%2C3%26%23178%3B%2C4%26%23178%3B%2C...%2C2005%26%23178%3B%2C2006%26%23178%3B%E7%9A%84%E5%92%8C%E7%9A%84%E4%B8%AA%E4%BD%8D%E6%95%B0%E5%AD%97.)
试求1²,2²,3²,4²,...,2005²,2006²的和的个位数字.
试求1²,2²,3²,4²,...,2005²,2006²的和的个位数字.
试求1²,2²,3²,4²,...,2005²,2006²的和的个位数字.
1²+2²+3²...+n²=n(n+1)(2n+1)/6
1²+2²+3²...+2006²
=2006*2007*4011/2
=8074227231