2° tarea

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


n=a1+d=-27+2            -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        -34/3,-32/3,-10,-28/3,-26/3,-8,-22/3,-20/3,-6

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

n=a1+d=67+-3.75           67,63.26,59.54,55.79,52.04,48.29,44.54,40.79,37.04,33.29

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

n=a1+d=128.15+-12.35           128.15,115.8,103.45,91.1,78.75,66.4

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

n=a1+d=63/7+-9/7            63/7,54/7,45/7,36/7,27/7,18/7,9/7,0,-9/7,-18/7,-27/7

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

sn=(a1+an)n/2       sn(-3+187)-75/2     (184)(-75)=-13800/2=-6900                      R=-6900

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

sn=(a1+an)n/2       sn=(2+215)164/2           (217)(164)=35588/2=17794          R=17794

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

sn=(a1+an)n/2       sn=(21+276)321/2       (297)(321)=95337/2=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=-126

10.- a1= 345 d= -169

n=a1+d(n+1)      345+-126(n-1)       176(n-1)       n-1=176     n=-176+1        n=-175