Question

resolver y sacar An y Sn

Answer 1

Respuesta:

-937 / 26     ;         - 22176 / 13

Explicación paso a paso:

a1= 1/2   ,   n= 96  ,  d = -5 / 13

An = a1 + ( n - 1 ) . d

An = 1/2 + ( 96-1 ) . ( -5/13 )  = 1/2 + ( 95 ) . -5 / 13

A96 = 1/2 - 475 / 13

A96  = -937 / 26

Sn = n/2 [ 2 a1 + ( n - 1 ) .d ]

S96 = 96/2 [ 2(1/2) + ( 96 - 1 ) . -5/13 ] = 48 [ 2/2 + (95 ) .-5/13 ]

S96 = 48 [ 1  -  475/13 ]  = 48 ( -462/13 ) =  - 22176/13

S96 =  - 22176 / 13