дана арифметическая прогрессия -7.-3.1....найдите сумму первых 12 членов
b1= -7 b2= -3 b3=1
q= b2:b1= -3: (-7)=
S12= = = ...
а1=-7
d=-3-(-7)=4
S12=
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b1= -7 b2= -3 b3=1
q= b2:b1= -3: (-7)=
S12=
= 
= ...
а1=-7
d=-3-(-7)=4
S12=