Question

ちか

3行目の式から4行目の式の式変換の仕方を教えてください┏○))ﾍﾟｺﾘ

*=ニ (rufi+xxfa+xgfs+xfa+…+x,fa)
n
円08S
[xfi+ (x」+h) fa+ (xi+2h) fa+ (xi+3h) fa+…+{xi+ (k-1)h}fa
ニ
n
1
[xi(A+fe+fs+fa+…+fa) +h{f2+2fs+3f;+ ……+ (k-1)f}]
n
1
*Ki*n+-{fe+2fs+ 3f4+ …+ (ks1)f 00 008+ (08S-)
h
=ー
n
n
h
=Xi+-{fe+2fs+3fa+…+(k-1) fa}
S20
から
30%
→テ
n
形できz