Mathematics
Senior High
どこの計算が間違っていますか？
= 2n²-3n
(+)2 (3²-76+4)= 32K²-72K - 24
3x/n(n+1)(2+)-7xgn(n+1) + An
- Jn (2^²+3n+²) - In²= {^~
= n² + ² n²+n_² n²=² {n+ 4n
0²-2012
C
= 3x gn(n+1)(2+1)-7x½ (4+1) An
-&n[n+l) (2n+1)-{/(n+1) +44
= -√√n [(nt() (2n+l) -√n-2 +8}
- £^(2^²7 2n+1-7-7-4)
=½n (2n²-41 (2)
2
= n(n²-2n+1) = n(n-1)²
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