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dimakovelko
dimakovelko
04.11.2020 14:22 •  Алгебра

Найдите сумму всех корней уравнения (log3x)^2=4

👇
Ответ:
magamedaliev150
magamedaliev150
04.11.2020
{ (log_{3}x)}^{2} = 4 \\ \\ log_{3}x = 2 \\ log_{3}( x) = - 2 \\ \\ x = {3}^{2} \\ x = { 3}^{ - 2} \\ \\ x = 9 \\ x = \frac{1}{9}
ОДЗ:
x > 0
=> оба корня удовл. ОДЗ.

Сумма корней: 9 + 1/9 = 9 целых 1/9
4,7(9 оценок)
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Ответ:
fhctybq123
fhctybq123
04.11.2020
1  yesterday i had  breakfast at the canteen.  2  last summer we went to the black sea.  3  he didn't call  me last week.  4  why did this girl come to  our office yesterday?   5  when did  you buy tickets last time?   6  last june the boys played  football every morning.  7  on sunday my parents  were at the theatre.  8  i didn't take part at the conference last month.  9  he lived in kiev in his childhood.  10  where did  he send his message?   2 трансформируйте предложения в past simplе  1  he often played chess.  2  our classes began at 9 a. m.  3  she  was always busy.  4  what did you do in the evening?   5  my sister didn’t study at school, she worked at the hospital. 6  my friend prefered tea to coffee.  7  i found many stories in this magazine.  8  he was in my room,  wasn't he?   9  why did you always ask so many questions?   10  jasmine seldom visited her grandparents. 3 образуйте отрицательную форму предложений  1  in summer she didn't get up early.  2  mr. white  didn't write a lot of letters yesterday.  3  on friday they weren't at the station.  4  we didn't  enjoy our time in rome.  5  they didn't  watch a football match last weekend.  6  the girl didn't open a box at once.  7  i didn't leave my keys on the table.  8  the engineer didn't go on business trip on monday.  9  my friend didn't want to move to another flat.  10  i didn't find a surprise in the present-box. 4 поставьте вопросы к предложениям.  1  he learned english at school. (where? what language? why? or …? )  where did he learn english? what language did he learn? why did he learn english? did he learn english or french? 2  the train was five hours late. (what? why? )  what was 5 hours late? why was the train five hours late? 3  i was going to stay at my aunt’s in the crimea. (where? who? or …? ) where was i going to stay in the crimea? who was going to stay at the aunt's in the crimea? was i going to stay at my aunt's or in the hotel in the crimea?   4  they stayed in moscow only for two days. (why? where? how long? ) why did they stay in m only for 2 days? where did they stay? how long did they stay in m?   5  i bought a very beautiful dress in this shop last weekend. (where? what? when? ) where did i buy a very beautiful dress last weekend? what did i buy in this shop last weekend? when did i buy this beautiful dress in the shop? 6  they traveled to cyprus by sea. (how? where? or …? ) how did they travel to c? where did they travel to? did they travel to c or ibiza?   7  i didn’t find your telephone number. (what? why? )  what didn't i find? why didn't i find your telephone number? 8  in his childhood he was always a leader among his friends. (what? when? who? )  what was he in his childhood? when was he a leader among his friends? who was always a leader among his friends in his childhood? 9  he caught a cold last month. (what? when? why? ) what did he catch? when did he catch a cold? why did he catch a cold?   10  we did our lessons together. (what? how? ) what did we do together? how did we do our lessons?
4,4(31 оценок)
Ответ:
Nime15
Nime15
04.11.2020

Приведены показательные функции, допустим у первых двух основание такое же как и у третьей функции.

f(x)=2^x

Основание больше больше 1, поэтому функция будет возрастающей. Пересечёт ось Оу в точке: (0;2^0) --> (0;1)

Ось абсцисс является горизонтальной асимптотой т.к. это показательная функция.

Теперь простейшие преобразования.

1. y=2ˣ +4 графиком этой функции будет график f(x) который сдвинут вверх на 4, т.к. к каждому значению f(x) мы прибавили 4,

значит E(y)=(0+4;+∞)=(4;+∞)

2. y=2ˣ -3 графиком этой функции будет график f(x) который сдвинут вниз на 3, т.к. от каждого значения f(x) мы отняли 3,

значит E(y)=(0-3;+∞)=(-3;+∞)

3. y=2ˣ +1 графиком этой функции будет график f(x) который сдвинут вверх на 1, т.к. к каждому значению f(x) мы прибавили 1,

значит E(y)=(0+1;+∞)=(1;+∞)

Смотри графики внизу.

Комментарий: на графике я тем же цветом обозначил горизонтальные асимптоты к функция соответствующего цвета.


Используя простейшие преобразования, постройте график функций: y=^x + 4, y=^x - 3, y=2^x + 1.
4,5(23 оценок)
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