- 8 +(- 7)+(-6)+(-5) +(-4)+(-3)+(-2) + (-1) + 0 +1 +2 +3 +4 +5 +6+7+8 +9 +10 =
= (8-8) +(7-7)+(6-6) +(5-5) +(4-4) +(3-3) +(2-2) +(1-1) + 0 + 9 + 10 =
= 9+10=19
Logₐb + logₐc = logₐ(bc)
log₃ (x - 1) + log₃ (x + 1) = 1
log₃ (x² - 1) = 1
log₃ (x² - 1) = log₃3
x² - 1 = 3
x² = 4
x₁ = 2
x₂ = -2
ОДЗ:
x - 1 > 0
x > 1
x + 1 > 0
x > -1
По ОДЗ не подходит x₂
Ответ: 2
Готово вот твоё решение :
7,8,10,14,22,38,70,134,262,498.
Y' = 5 -5/(x +3)
5 -5/(x +3) = 0
(5x +15 -5)/(x +3) = 0
5x +10 = 0
x = -2 ∈ [-2,5; 0]
a) х = -2,5
y = 5*(-2,5) -ln0,5^5 = -12,5 +5ln2
б) х = 0
y = 5*0 -ln3^5= -ln3^5
в) х = -2
y = 5*(-2) -ln1 = -10
Ответ: -10