wyznacz ciag arytmetyczny, wiedzac, ze jego czwarty wyraz wynosi 2, a dziesiaty -10
a₄ = a₁ + 3r = 2
a₁₀ = a₁ + 9r = -10
a₁ + 3r = 2
a₁ + 9r = -10
------------------
6r = -12
r = -2
a₁ + 3*(-2) = 2
a₁ - 6 = 2
a₁ = 8
an = 8 + (n-1)(-2) = 8 - 2n + 2 = -2n + 10
----------------------------------------------------------------------------------------------------
Litterarum radices amarae sunt, fructus iucundiores
Pozdrawiam :)
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a₄ = a₁ + 3r = 2
a₁₀ = a₁ + 9r = -10
a₁ + 3r = 2
a₁ + 9r = -10
------------------
6r = -12
r = -2
a₁ + 3*(-2) = 2
a₁ - 6 = 2
a₁ = 8
an = 8 + (n-1)(-2) = 8 - 2n + 2 = -2n + 10
----------------------------------------------------------------------------------------------------
Litterarum radices amarae sunt, fructus iucundiores
Pozdrawiam :)