TaReAa Nº 3

1.- a1= -27 d= 2 12 términos
N=a1 + d = - 27+2=-25=-23=-21=-19=-17=-15=-13=-11=-9=-7=-5=-3=-1

2.- a1= -34/9 d= 2/3 9 términos
n=a1+d=
34/9+2/3=120/27=214/81=804/243=2898/729=10152/2187+2/3=36230/6561=121812/19683=404802/59049=239544/177147

3.- a1= 67 d= -3.75 10 términos
n=a1+d= 67+3.75=70.75=74.50=78.25=82=85.75=89.50=93.25=97=100.75=104.50

4.- a1= 128.15 d=-12.35 7 términos
n=a1+d=
128.15+12.35=140.5=152.85=165.2=177.55=189.9=202.25=214.6=226.95

5.- a1= 63/7 d= -9/7 11 términos
N=a1+d= 63/7+9/7=72/7=81/7=90/7=99/7=108/7=117/7=126/7=135/7=144/7=153/7=162/7


6. - a1= -3 an= 187 n= -75
sn = (a1+an) n = (-190)(-75) 14250= 7125

7.- a1= 2 an= 215 n= 164

sn = (a1+an) n = (217)(164) = 33588 =16794

8.- a1= 21 an= 276 n= 321
sn = (a1+an) n = (297)(321) = 95337 = 47668.5

9.- a1= -78 d= -49

N=a1+d (n-1)
=78+-49(n-1)
=-127(n-1)
N-1=-127
n=-127+1
n=-128

10.- a1= 345 d= -169
N=a1+d (n-1)
=345+ -169= (n-1)
=-514(n-1)
N - 1= -514
n= -514 + 1
n= -515