
1.    
(
)
:−
2.   =
∑
∑
3.   ℎ = +
∑
∑
;
(
=
−
)
4.   ℎ = + 󰇡
∑
∑
󰇢ℎ ; 󰇡
=
󰇢
5.  = +󰇡




󰇢ℎ
6.  = +

ℎ