Ответ: 62,4.
Объяснение:
b1=-0,6; b2= 3; b3= -15;...
q=3/(-0.6)= -5;
q=-15/3= -5;
q= -5.
------------
b1 = -0.6;
b4 = b1*q³ = -0,6*(-5)³ = 0.6*125 =75.
b4=75.
S4 = b1(q⁴ - 1)/(q-1) = - 0,6((-5)⁴-1)/(-5-1)=-0,6*624/-6= 62,4.
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Ответ: 62,4.
Объяснение:
b1=-0,6; b2= 3; b3= -15;...
q=3/(-0.6)= -5;
q=-15/3= -5;
q= -5.
------------
b1 = -0.6;
b4 = b1*q³ = -0,6*(-5)³ = 0.6*125 =75.
b4=75.
------------
S4 = b1(q⁴ - 1)/(q-1) = - 0,6((-5)⁴-1)/(-5-1)=-0,6*624/-6= 62,4.