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marina1813
@marina1813
July 2022
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решите уравнение,пожалуйста.5^2х+1-3*5^2х-1=550;.lg(x-1)+lg(x+1)=lg 8+lg(x-2)
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sangers1959
Verified answer
5²ˣ⁺¹-3*5²ˣ⁻¹=550
5*5²ˣ-(3/5)*5²ˣ=550
5*5²ˣ-0,6*5²ˣ=550
4,4*5²ˣ=550 |÷4,4
5²ˣ=125
5²ˣ=5³
2x=3
x=1,5.
Ответ: x=1,5.
lg(x-1)+lg(x+1)=lg8+lg(x-2)
ОДЗ: x-1>0 x>1 x+1>0 x>-1 x-2>0 x>2 ⇒ x∈(2;+∞)
lg((x-1)(x+1))=lg(8*(x-2))
lg(x²-1)=lg(8x-16)
x²-1=8x-16
x²-8x+15=0 D=4
x₁=5 ∈ ОДЗ x₂=3 ∈ ОДЗ.
Ответ: х₁=5 х₂=3.
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Verified answer
5²ˣ⁺¹-3*5²ˣ⁻¹=5505*5²ˣ-(3/5)*5²ˣ=550
5*5²ˣ-0,6*5²ˣ=550
4,4*5²ˣ=550 |÷4,4
5²ˣ=125
5²ˣ=5³
2x=3
x=1,5.
Ответ: x=1,5.
lg(x-1)+lg(x+1)=lg8+lg(x-2)
ОДЗ: x-1>0 x>1 x+1>0 x>-1 x-2>0 x>2 ⇒ x∈(2;+∞)
lg((x-1)(x+1))=lg(8*(x-2))
lg(x²-1)=lg(8x-16)
x²-1=8x-16
x²-8x+15=0 D=4
x₁=5 ∈ ОДЗ x₂=3 ∈ ОДЗ.
Ответ: х₁=5 х₂=3.