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polina5m
polina5m
05.05.2020 07:51 •  Алгебра

Среди 15 студентов, из которых 4 девушки, разыгрывается 5 билетов. какова вероятность того, что все девушки получат билеты?

👇
Ответ:
gerl1999
gerl1999
05.05.2020
P= \frac{C_4^4*C_{11}^1}{C_{15}^5}= \frac{1*11}{3003}= 0.0036
4,4(39 оценок)
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Ответ:
гсооагвгв
гсооагвгв
05.05.2020

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Must Waste More Time...

4,8(58 оценок)
Ответ:
galina7257
galina7257
05.05.2020

В решении.

Объяснение:

Дана функция у=√х:  

а) График которой проходит через точку с координатами А(а; 3√5). Найдите значение а.  

Нужно в уравнение подставить известные значения х и у (координаты точки А):  

3√5 = √а  

(3√5)² = (√а)²  

9*5 = а  

а=45;  

б) проходит ли график этой функции через точки А(36; -6), B(0,81; 0,9).

Чтобы определить принадлежность точки графику, нужно известные значения х и у (координаты точки) подставить в уравнение. Если левая часть равна правой, то принадлежит, и наоборот.  

1) А(36; -6)

-6 = ±√36

-6 = -6, проходит.

2) B(0,81; 0,9)

0,9 = ±√0,81

0,9 = 0,9, проходит.

в) Если х∈[4; 8], то какие значения будет принимать данная функция?  

у= √х  

у=√4=2;  

у=√8=√4*2=2√2;  

При х∈ [4; 8]   у∈ [2; 2√2].  

с) y∈ [6; 13]. Найдите значение аргумента.  

6 = √х  

(6)² = (√х)²  

х=36;  

13 = √х  

(13)² = (√х)²  

х=169;  

При х∈ [36; 169]   y∈ [6; 13].  

4,5(15 оценок)
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