1+4+9+16+25+36+49+64+81+100+121+144+169+196+225+256+289+324+361+400
+441+484=3795
以上是土方法,公式如下:
1²+2²+。。。+n²=n(n+1)(2n+1)/6
∵22²<500<23²
∴1²+2²+。。。+22²=22(22+1)(2*22+1)/6=3795
郭敦顒回答:
4+9+16+25+36+49+64+81+100+121+144+169+196+225+256+289+324+361+400
+441+484=3794