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Pedrinhopessano
@Pedrinhopessano
January 2020
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Somando todos os numeros inteiros desde -50, inclusive, ate 51, inclusive, obtem-se:
A)-50
B)-49
C)0
D)50
E)51
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(-50,-49,-48,...,51)
r=-49-(-50)
r=-49+50
r=1
an=a₁+(n-1)r
51=-50+(n-1)1
51+50=n-1
101=n-1
n=101+1
n=102
Sn=(a₁+an)n/2
S₁₀₂=(-50+a₁₀₂)102/2
S₁₀₂=(-50+51)51
S₁₀₂=1×51
S₁₀₂=51
Alternativa e)
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r=-49-(-50)
r=-49+50
r=1
an=a₁+(n-1)r
51=-50+(n-1)1
51+50=n-1
101=n-1
n=101+1
n=102
Sn=(a₁+an)n/2
S₁₀₂=(-50+a₁₀₂)102/2
S₁₀₂=(-50+51)51
S₁₀₂=1×51
S₁₀₂=51
Alternativa e)