Pautova1119
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Fill in the gaps with some, any, no, much, many, few, a few, little, a little 1. I have time to do the dishes now. The guests are coming in 15 minutes. Let’s do the dishes together. 2. students were able to pass the exam. It was rather disappointing. 3. Can I have tea, please? It’s very cold here. 4. We need to hurry! We don't have time left. 5. Ryan had so in his mind that he couldn't concentrate on anything anymore. 6. Have you got English books at home? - Yes, I have . 7. people might like to live a lonely life, but most don't. 8. Very people are actually happy with their salaries. 9. 'Do you ever go to Atlantic City?' 'Yes, I go there times every year.' 10. This town is a very interesting place to visit. I wish I could stay here longer.

Алгебра

Ответы

betepah
Область допустимых значений (ОДЗ): x >= -4.
x - 4*V(x + 4) - 1 < 0 ( V - корень квадратный).
x - 1 < 4*V(x + 4)
Правая часть неравенства <= 0 для всех х из ОДЗ, левая часть < 0 при x < 1, то есть неравенство выполняется при x < 1,
с учетом ОДЗ получаем -4 <= х < 1.
Пусть x >= 1.
Возведем обе части неравенства в квадрат
(x - 1)^2 < 16*(x + 4)
x^2 - 2*x + 1 < 16*x + 64
x^2 - 18*x - 63 < 0
Равенство верно на интервале между корнями уравнения.
Корни х1 = -3, х2 = 21, неравенство выполняется для -3 < х < 21, с учетом x >= 1 получаем 1 <= х < 21.
Объединяем условия -4 <= х < 1 и 1 <= х < 21, получаем
ответ: -4 <= х < 21.
hobpack

Объяснение:

1) Kl=12; KM:ML= 3 : 1

KM=3ML

KM+ML=KL

3ML+ML=12

4ML=12

ML=3

KM=3ML=9

2) AB/ED=YX/LK;   AB= 2 см, ED= 3 см и LK= 27 см

YX=LK·AB/ED=27·2/3=54/3=18

YX=18 см

3) ΔKBC∼ΔRTG;  k= 18;  P₁=8; S₁=9;  P₂=?, S₂=?

Условие не полное. Не определена зависимость сторон от коэффициента подобия к. То есть какие стороны подобны(это не обязательно), а главное порядок отношения сторон относительно к.

Рассмотрю оба случая:

a) ΔKBC∼ΔRTG⇒P₂/P₁=k; S₂/S₁=k²

P₂=kP₁=8·18=144 см

S₂=k²S₁=8²·9=64·9=576 см²

б) ΔKBC∼ΔRTG⇒P₁/P₂=k; S₁/S₂=k²

P₂=P₁/=18/8=2,25 см

S₂=S₁/k²=9/8²=9/64  см²

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Fill in the gaps with some, any, no, much, many, few, a few, little, a little 1. I have time to do the dishes now. The guests are coming in 15 minutes. Let’s do the dishes together. 2. students were able to pass the exam. It was rather disappointing. 3. Can I have tea, please? It’s very cold here. 4. We need to hurry! We don't have time left. 5. Ryan had so in his mind that he couldn't concentrate on anything anymore. 6. Have you got English books at home? - Yes, I have . 7. people might like to live a lonely life, but most don't. 8. Very people are actually happy with their salaries. 9. 'Do you ever go to Atlantic City?' 'Yes, I go there times every year.' 10. This town is a very interesting place to visit. I wish I could stay here longer.
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