wyznacz wskazany wyraz ciagu arytmetycznego.
a)5,3,1,....,a15=?
b)-6y,-3y,0,...,dn=?
a) 5, 3, 1, ..., a15
3 - 5 = -2
1 - 3= -2
różnica ciągu wynosi -2
1 -2 = -1 -2 = -3 -2 = -5 -2 = -7 - 2 = -9 - 2 = -11 -2 = -13 - 2 = -15 - 2 =-17 - 2= -19 - 2 =-21 -2 = -23
lub ze wzoru
an = a1 + (n-1)r
n = 15, r = -2
a15 = 5 + (15-1)*(-2)
a15 = 5 + 14*(-2)
a15 = 5 - 28
a15 = -23
b)
-6y, -3y, 0, ..., an
-3y - (-6y) = 3y
r = 3y
an = a1 + (n-1)*r
an = -6y +(n-1)*3y
an = -6y -3y(n-1)
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a) 5, 3, 1, ..., a15
3 - 5 = -2
1 - 3= -2
różnica ciągu wynosi -2
1 -2 = -1 -2 = -3 -2 = -5 -2 = -7 - 2 = -9 - 2 = -11 -2 = -13 - 2 = -15 - 2 =-17 - 2= -19 - 2 =-21 -2 = -23
lub ze wzoru
an = a1 + (n-1)r
n = 15, r = -2
a15 = 5 + (15-1)*(-2)
a15 = 5 + 14*(-2)
a15 = 5 - 28
a15 = -23
b)
-6y, -3y, 0, ..., an
-3y - (-6y) = 3y
r = 3y
an = a1 + (n-1)*r
an = -6y +(n-1)*3y
an = -6y -3y(n-1)