Предмет: Алгебра, автор: mamiyaa

Решите пожалуйста показательные уравнения под буквой "и" пример
Не умею их решать вообще, решите пожалуйста и распишите решение. Огромное спасибо!!!

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Ответы

Автор ответа: nKrynka
0
Решение
2^(2x - 2y) + 2^(x - y) = 2
2^(2x + 1) + (1/2)^(2y - 1) = 5

2^(2x - 2y) + 2^(x - y = 2
2^[2*(x - y)] + 2^(x - y) = 2
2^(x - y) = z, z > 0
z² + z - 2 = 0
z₁ = - 2 не удовлетворяет условию z > 0
z₂ = 1
2^(x - y) = 1
2^(x - y) = 2⁰
x - y = 0
x = y
подставим у = х во второе уравнение
2^(2x + 1) + (1/2)^(2y - 1) = 5
2^(2x + 1) + (1/2)^(2x - 1) = 5
2*2^(2x)  + 2*(1/2)^(2x) - 5 = 0
умножим на 2^(2x)
2*2^(4x)  - 5*2^(2x) + 2 = 0
2^2x = t
2t² - 5t + 2 = 0
D = 25 - 4*2*2 = 9
t₁ = (5 - 3)4
t₁ = 1/2
t₂ = (5 + 3)/4
t₂ = 2
1) 2^2x = 1/2
2^2x = 2⁻¹
2x = - 1
x₁ = - 1/2

2^2x = 2¹
2x = 1
x₂ = 1/2
так как x = y, то 
y₁ = - 1/2
y₂ = 1/2
Ответ: (- 1/2; - 1/2) (1/2 ; 1/2)


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ДАМ 20 БАЛЛОВ ПОЖАЛУЙСТА БЫСТРЕЕ

Match the titles to the routines. One title is extra.

A. A Busy Businessman
B. A Typical Schoolboy
C. A Successful Actress
D. A School Teacher
E. A Good Doctor

1. I wake up at 9, do morning exercises for an hour and eat a
healthy breakfast. After breakfast I read books on acting or
watch education programmes. It’s important to learn. Then
I check e-mails, talk to the manager and agents. In the afternoon
I practise my monologues. I have a light lunch. In the evening
I have a performance. My life is hard work!
2. I get up very early, usually at 6 o’clock. After a quick breakfast
I look through my lesson plans and at 7.30 I go to work. I give
four or five English classes a day. After lunch I go to the library
to look for some interesting material and prepare computer
tasks. Then I’m busy with our drama society. I go home at 5 or
6 pm taking any unfinished work.
3. The alarm clock wakes me up every morning at 5.30. I do
some exercises and have a quick breakfast. I am at work at 7.30.
At 8 we have a meeting to discuss what problems our patients
have and the strategy of the day. Then I examine my patients and
get ready for operations if I have any. In the evening after a hard
day I go swimming. Sport helps me to keep fit.
4. Discipline is the most important factor in a person’s professional
life. Success is the result of many things. Hard work,
brains, careful planning. I get up at 7, go jogging, take a cold
shower and have a good breakfast. At 9 I’m at my office. I read
e-mails and prepare for the talks with the partners from different
companies. We have lunch at 12.30. After lunch we usually have
meetings of the staff to discuss our plans. I go home at 8 pm or
later.