Oblicz S₃₅, wiedząc, że an=8-5n
an=8-5n
a1=8-5*1=8-5=3
a35=8-5*35=8-175=-167
S35 = (a1+an)/2*n ze wzoru, czyli
S35= (3-167)/2*35= -164/2*35=-82*35=-2870
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an=8-5n
a1=8-5*1=8-5=3
a35=8-5*35=8-175=-167
S35 = (a1+an)/2*n ze wzoru, czyli
S35= (3-167)/2*35= -164/2*35=-82*35=-2870