Rozwiąż te zadanie :
an=6-4n
a₁=6-4*1=6-4=2
S₂₀=(2+20)/2*20=11*20=220
An = 6 -4n
A1 = 6 - 4 =2
S20 = ((2+20)/2) *20
S20 = 11*20 = 220
S20 = 220
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an=6-4n
a₁=6-4*1=6-4=2
S₂₀=(2+20)/2*20=11*20=220
An = 6 -4n
A1 = 6 - 4 =2
S20 = ((2+20)/2) *20
S20 = 11*20 = 220
S20 = 220