Home
О нас
Products
Services
Регистрация
Войти
Поиск
alenavischnevs
@alenavischnevs
August 2022
1
4
Report
помогите решить номер 145(2) и 147(2)
желательно подробно и с одз
Please enter comments
Please enter your name.
Please enter the correct email address.
Agree to
terms of service
You must agree before submitting.
Send
Answers & Comments
hovsep50
145.2
A = log(2-x) 27 - log(x-2)^4 9 = 0,625
2-x >0 ; 2-x ≠1 ⇒ x<2 ; x≠1
log(x-2)^4 9 = log(2-x)^4 9 = [log(2-x) 9] /[log(2-x) (2-x)^4] =
= [log(2-x) 9] /4
⇒ 4·[log(2-x) 3³] - log(2-x) 3² = 2,5
log(2-x) 3^12 - log(2-x) 3² = 2,5
log(2-x) (3^12 /3²) = log(2-x) 3^10 = 10·log(2-x) 3 = 2,5
log(2-x) 3 = 0,25
4·log(2-x) 3 = 1
log((2-x) 3^4 = 1
2-x = 3^4 = 81
x = -79
147.2
B=[log(2) x]^4 + 3[log(2) x]² -4 = 0
x>0 ; обозначим [log(2) x]² =y ⇒
y² +3y -4 =0
(y-1)·(y+4)=0 ⇒
y1= 1 ⇔ [log(2) x]² = 1 ⇒ log(2) x = +/-1 ⇒
log(2) x1 = 1 ⇔ x1 = 2
log(2) x2 = -1 ⇔ x2 = 1/2
y2 = -4 не уд., т.к [log(2) x]² >0
Ответ: 2 ; 0,5
2 votes
Thanks 0
More Questions From This User
See All
alenavischnevs
July 2022 | 0 Ответы
pomogite reshit logarifmytechto obvedeny kruzhochkom dayu 99ballov
Answer
alenavischnevs
June 2022 | 0 Ответы
pomogite reshit logarifmy 86
Answer
alenavischnevs
June 2022 | 0 Ответы
vse storony treugolnik abc razdeleny popolam tochkami def vo skolko raz plosh
Answer
alenavischnevs
September 2021 | 0 Ответы
otrezki av i sd yavlyayutsya hordami okruzhnostinajdite rasstoyanie ot centra okruzhno
Answer
alenavischnevs
September 2021 | 0 Ответы
pomogite perevesti tekstkachestvenno muzej zapovednik fityutcheva v sele ovstug
Answer
alenavischnevs
August 2021 | 0 Ответы
x]=3...
Answer
рекомендуемые вопросы
rarrrrrrrr
August 2022 | 0 Ответы
o chem dolzhny pozabotitsya v pervuyu ochered vzroslye pri organizacionnom vyvoze n
danilarsentev
August 2022 | 0 Ответы
est dva stanka na kotoryh vypuskayut odinakovye zapchasti odin proizvodit a zapcha
myachina8
August 2022 | 0 Ответы
najti po grafiku otnoshenie v3v1 v otvetah napisano 9 no nuzhno reshenie
ydpmn7cn6w
August 2022 | 0 Ответы
Choose the correct preposition: 1.I am fond (out,of,from) literature. 2.where ar...
millermilena658
August 2022 | 0 Ответы
opredelite kak sozdavalas i kto sozdaval arabskoe gosudarstvo v kracii
MrZooM222
August 2022 | 0 Ответы
ch ajtmanov v rasskaze krasnoe yabloko ispolzuet metod rasskaz v rasskaze opi
timobila47
August 2022 | 0 Ответы
kakovo bylo naznachenie kazhdoj iz chastej vizantijskogo hrama pomogite pozhalujsta
ivanyyaremkiv
August 2022 | 0 Ответы
moment. 6....
pozhalujsta8b98a56c0152a07b8f4cbcd89aa2f01e 97513
sarvinozwakirjanova
August 2022 | 0 Ответы
pomogite pozhalusto pzha519d7eb8246a08ab0df06cc59e9dedb 6631
×
Report "помогите решить номер 145(2) и 147(2) желательно подробно и с одз..."
Your name
Email
Reason
-Select Reason-
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Description
Helpful Links
О нас
Политика конфиденциальности
Правила и условия
Copyright
Контакты
Helpful Social
Get monthly updates
Submit
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
A = log(2-x) 27 - log(x-2)^4 9 = 0,625
2-x >0 ; 2-x ≠1 ⇒ x<2 ; x≠1
log(x-2)^4 9 = log(2-x)^4 9 = [log(2-x) 9] /[log(2-x) (2-x)^4] =
= [log(2-x) 9] /4
⇒ 4·[log(2-x) 3³] - log(2-x) 3² = 2,5
log(2-x) 3^12 - log(2-x) 3² = 2,5
log(2-x) (3^12 /3²) = log(2-x) 3^10 = 10·log(2-x) 3 = 2,5
log(2-x) 3 = 0,25
4·log(2-x) 3 = 1
log((2-x) 3^4 = 1
2-x = 3^4 = 81
x = -79
147.2
B=[log(2) x]^4 + 3[log(2) x]² -4 = 0
x>0 ; обозначим [log(2) x]² =y ⇒
y² +3y -4 =0
(y-1)·(y+4)=0 ⇒
y1= 1 ⇔ [log(2) x]² = 1 ⇒ log(2) x = +/-1 ⇒
log(2) x1 = 1 ⇔ x1 = 2
log(2) x2 = -1 ⇔ x2 = 1/2
y2 = -4 не уд., т.к [log(2) x]² >0
Ответ: 2 ; 0,5