2da tarea sucesiones y series numéricas

Resolver en su blog las siguientes sucesiones y series Numéricas:



1.- a1= -27 d= 2 12 terminos
  n= a1 + d

  -27,-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5

2.- a1= -34/9 d= 2/3 9 terminos
  n=a1 + d

  -34/9+2/3=120/27+2/3=414/81+2/3=1404/243+2/3=4698/729+2/3
 =15552/2187+2/3=51030/6561+2/3=166212/19683+2/3=538002/59049


3.- a1= 67 d= -3.75 10 terminos
  n=a1 + d

  67-3.75=63.25,59.50,55.75,52.00,48.25,44.50,40.75,37.00,33.25,29.50


4.- a1= 128.15 d=-12.35 7 terminos
  n=a1 + d

  128.15-12.35=115.80,103.45,91.10,78.75,66.40,54.05,41.70


5.- a1= 63/7 d= -9/7 11 terminos
   n=a1 + d

  63/7+-9/7=54/7,45/7,36/7,27/7,18/7,9/7,0/7,-9/7,-18/7,-27/7,-36/7


6.- a1= -3 an= 187 n= -75
  sn=(a1+an)n/2

  sn=(-3+187)-75/2=(-184)(-75)/2=13800/2=6900
  

7.- a1= 2 an= 215 n= 164
  sn=(a1+an)n/2

  sn=(2+215)164/2=(217)(164)/2=35588/2=17794


8.- a1= 21 an= 276 n= 321
  sn=(a1+an)n/2

  sn=(21+276)321/2=(297)(321)/2=95337/2=476685


9.- a1= -78 d= -49
   n=a1+d (n-1)
 
   =-78+-49 (n-1)
   =-127(n-1)
   n-1=-126

10.- a1= 345 d= -169
   n=a1+d (n-1)

   =345+-169 (n-1)
   =176 (n-1)
   n-1= 175