Ответ:
________
[tex] \frac{ \frac{3}{4}(2 {}^{5} - 1) }{3} [/tex]
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Ответ:
b3=3
b5=12
________
b1,q,S5=?
{b3=b1q² 3=b1q²
{b5=b1q⁴ 12=b1q⁴
q²=4
q=2
3=b1×4
b1=3/4
S5=
[tex] \frac{ \frac{3}{4}(2 {}^{5} - 1) }{3} [/tex]
S5=7.75