Ответ:
Ответ и решение в закрепе
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log9 3^(5x - 5) = 4
log9 9^ ((5x-5)/2) = log9 9^4
(5x - 5)/2 = 4
5x - 5 = 8
5x = 13
x = 13/5
x = 2,6
Ответ. 2,6
Q=b2:b1=-250:(-1250)=0,2
b1•(q^5–1) (-1250)•(-3124/3125)
S5= --------------- = ----------------------------
(q–1) 0,2–1
(2•3124)/5
= --------------- = 1249,6:(-0,8) = -1562
-0,8