2da tarea de algebra

1.- a1= -27 d= 2 12 términos







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




2.- a1= -34/9 d= 2/3 9 términos


n=a1+d=


34/9+2/3=120/27+2/3=414/81=1404/243=4711/729+2/3=15591/2187+2/3=51147/6561+2/3=166563/19683+2/3=539055/59049+2/3=1735263/177147


3.- a1= 67 d= -3.75 10 términos



n=a1+d= 67+-3.75=63.25+-3.75=59.50+-3.75=55.75+-3.75=52+-3.75=48.25+-3.75=44.50+-3.75=40.75+-3.75=37+-3.75=33.25+-3.75=29.50






4.- a1= 128.15 d=-12.35 7 términos


n=a1+d=


128.15+-12.35=115.80+-12.35=103.45+-12.35=91.10+-12.35=78.75+-12.35=66.40+-12.35=54.05+-12.35=41.70+-12.35=29.35






5.- a1= 63/7 d= -9/7 11 términos


N=a1+d= 63/7+-9/7=54/7+-9/7=45/7+-9/7=36/7+-9/7=27/7+-9/7=18/7+-9/7=9/7+-9/7=-9/7+-9/7=-18/7+ -9/7=-27/7+-9/7=-36/7+-9/7=-45/7

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


sn = (a1+an) n = (-190)(-75) =14250= 7125
             2                    2              2






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


sn = (a1+an) n = (217)(164) = 33588 =16794
             2                   2                2






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


sn = (a1+an) n = (297)(321) = 95337 = 47668.5
             2                   2              2






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