ellie-butler_6094e531c0927
ellie-butler_6094e531c0927
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a1=x r=x a20=-100 an = a1 + (n-1)r -100=x+(20-1)x -100=x+20x-1x -100=20x -100/20=x -5=x Então, o a1=-5 e a razão -5. a P.A.: (-5.-10,-15,-20,...,-100) Fórmula da soma: Sn=(a1+an)n/2 Sn=(-5+-100)20/2 Sn=-105.20/2 Sn=-2100/2 …