giúp em bài toán 6 này ạ

L

letsmile519

theo cong thuc quy nap cho n so,
1^2+2^2+3^2+...+n^2=n(n+1)(2n+1)/6
ta co the de dang cm ct tren bang pp quy nap
voi n=100 ta co ^2+2^2+3^2+...+100^2=100*101*201/6=338350
 
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