Oblicz sumę liczb naturalnych od 7 do 135 włącznie.
a₁=7
a₂=8
r=8-7=1
an=a₁+(n-1)r
135=7+(n-1)
135=7+n-1
n=135-6=129
S₁₂₉=(a₁+a₁₂₉)/2×129=(7+135)/2×129=9159
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a₁=7
a₂=8
r=8-7=1
an=a₁+(n-1)r
135=7+(n-1)
135=7+n-1
n=135-6=129
S₁₂₉=(a₁+a₁₂₉)/2×129=(7+135)/2×129=9159