Ответ: 162 или -32,4.
Объяснение:
q²=b₄:b₂; q²=16:36; q²=4/9; q=±2/3.
При q=2/3 b₁=b₂:q=36:2/3=36*3/2=54,
S=b₁:(1-q)=54:(1-2/3)=54:1/3=54*3=162.
При q= -2/3 b₁=b₂:q=36:(-2/3)=36*(-3/2)= -54,
S=b₁:(1-q)= -54:(1+2/3)= -54:5/3= -54*3/5= -162/5= -32,4.
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Ответ: 162 или -32,4.
Объяснение:
q²=b₄:b₂; q²=16:36; q²=4/9; q=±2/3.
При q=2/3 b₁=b₂:q=36:2/3=36*3/2=54,
S=b₁:(1-q)=54:(1-2/3)=54:1/3=54*3=162.
При q= -2/3 b₁=b₂:q=36:(-2/3)=36*(-3/2)= -54,
S=b₁:(1-q)= -54:(1+2/3)= -54:5/3= -54*3/5= -162/5= -32,4.