Предмет: Алгебра, автор: nikirson10

Пожалуйста, решите хоть одно задания, буду очень благодарен!​

Приложения:

Ответы

Автор ответа: sangers1959
1

Ответ:

Объяснение:

1. y=7*⁴√(9-x²)-4*√(2x+1)-3

ОДЗ: {9-x²≥0     {(3-x)(3+x)≥0    -∞__-__-3__+__3__-__+∞   x∈[-3;3]

         {2x+1≥0     {2x≥-1  |÷2        {x≥-1/2    x∈[-1/2;+∞)    ⇒

Ответ: x∈[-1/2;3].

2. y=7-√(2x-1)-5*⁴√(x-5)

ОДЗ: {2x-1≥0      {2x≥1  |÷2      {x≥1/2      x∈[1/2;+∞)

         {x-5≥0       {x≥5               {x≥5        x∈[5;+∞).     ⇒

x∈[5;+∞)

у приобретает наибольшее значение при минимальных

значениях √(2x-1) и ⁴√(x-5), то есть при х=5:

yнаиб=7-√(2*5-1)-5*⁴√(x-5)=7-√(10-1)-5*⁴√(5-5)=7-√9-5*⁴√0=7-3-0=4.

Ответ: унаиб=4.

3. 2/(√(4-x²)≥-5

ОДЗ: 4-x²>0  (2-x)(2+x)>0   -∞__-__-2__+__2__-__+∞  x∈(-2;2).

(2/(√(4-x²))+5≥0

(2+5*√(4-x²))/√(4-x²)≥0

Так как √(4-x²)>0    ⇒     2+5*√(4-x²)≥0     ⇒    

Решение этого неравенства: x∈(-2;2), ⇒   целые решения:-1, 0, 1.

Ответ: 3 целых решения: -1. 0. 1.

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