please help me!设n为正整数,定义符号An表示1的平方加2的平方加3的平方...加n的平方的个位数字,n=1,2,3,.,试探索An的规律.An=An+20[n=1,2,3,.],A1,A2,A3,...An是以20为同期的.我实在是看不懂.

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