Oblicz sumę 100 początkowych wyr. ciągu arytmetycznego gdzie a1= -5,5, a2= -5, a3= - 4,5
Sn=[(a1+an)/2]*n
a1=-5.5
an=a1+(n-1)r
r=0,5
a100=-5.5+99*0,5
a100=-5.5+49.5=44
S100=[(-5.5+44)/2]*100=3850/2=1925
a1+r = a2
-5,5+r = -5
r = -5+5,5
r = 0,5
a100 = a1+99r
a100 = -5,5+99*0,5
a100 = -5,5+49,5
a100 = 44
Sn = (a1+an)/2 *n
S100 = (-5,5+44)/2 * 100
S100 = 38,5/2 *100
S100 = 19,25*100
S100 = 1925
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Sn=[(a1+an)/2]*n
a1=-5.5
an=a1+(n-1)r
r=0,5
a100=-5.5+99*0,5
a100=-5.5+49.5=44
S100=[(-5.5+44)/2]*100=3850/2=1925
a1+r = a2
-5,5+r = -5
r = -5+5,5
r = 0,5
a100 = a1+99r
a100 = -5,5+99*0,5
a100 = -5,5+49,5
a100 = 44
Sn = (a1+an)/2 *n
S100 = (-5,5+44)/2 * 100
S100 = 38,5/2 *100
S100 = 19,25*100
S100 = 1925