2da tarea

1.- a1= -27 d= 2 12 términos

r= (-27)+2=-25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3



2.- a1= -34/9 d= 2/3 9 términos

r= -37/9+2/3 =-111+18/27=-93/27+2/3=-225/81+2/3=-675/243+2/3=-1539/729+2/3=-3159/2187+2/3=-5103/6561+2/3=-2187/19683+2/3=32805/59049+2/3=216513/177147



3.- a1= 67 d= -3.75 10 términos

r= 67+ (-3.75)=63.25, 59.5, 55.75, 52, 48.25, 44.5, 40.75, 37, 33.25, 29.5



4.- a1= 128.15 d=-12.35 7 términos

r= 128.15+ (-12.35)=115.8, 103.45, 91.1, 78.75, 66.4, 54.05, 41.7



5.- a1= 63/7 d= -9/7 11 términos

r=54/7, 45/7, 36/7, 27/7, 18/7, 9/7, 0/7, -18/7, -27/7, -36/7, -45/7.



6.- a1= -3 an= 187 n= -75

sn= (-3+187)-75/2=(184)-75/2=-13,800/2=6,900



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

sn= (2+215)164/2= (217)164/2=35,588/2=17,794



8.- a1= 21 an= 276 n= 321

sn= (21+276)321/2=(297)321/2=95,337/2=47,668.5



9.- a1= -78 d= -49

r= an= -78+ (-49) (n-1)

=-127 (n-1)

(n-1) =-127

n=-127+1

n=-126



10.- a1= 345 d= -169

R= an=345+(-169) (n-1)

=176 (n-1)

(n-1) =176

n =176+1

n =177