Алгебраические дроби и формулы сокращённого умножения.Помогите пожалуйста, нужна...

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Алгебраические дроби и формулы сокращённого умножения.
Помогите пожалуйста, нужна проверка собственных ответов. Можете решить не всё, парочку примеров.

Answers & Comments

daraprelj

1) (√a - 5)(√a+5) = (√a)²-5² = a-25

Подставляем значение:

25,2-25 = 0,2

2) 16ab+2*(-a+4b) = 16ab+2*((-a)²+2*(-a)*(4b)+(4b)²) = 16ab+2*(a²-8ab+16b²) = 16ab+2a²-16ab+32b² = 2a²+32b² = 2*(a²+16b²)

Подставляем значения:

2*((√3)²+16*(√5)²) = 2*(3+80)=166

$\frac{3 {a}^{2} - 21a }{ {a}^{2} - 49 } = \frac{3a \times (a - 7)}{(a + 7)(a - 7)} = \frac{3a}{a + 7}$

Подставляем значения:

$\frac{3 \times ( - 7.1)}{ - 7.1 + 7} = \frac{ - 21.3}{ - 0.1} = 213$

$4x - \frac{4 {x}^{2} - 5c }{x} = \frac{4 {x}^{2} - 4 { x}^{2} - 5c }{x} = - \frac{5c}{x}$

Подставляем значения:

$- \frac{5 \times \sqrt{63} }{ \sqrt{7} } = - \frac{5 \times \sqrt{9 \times 7} }{ \sqrt{7} } = - \frac{5 \times 3 \sqrt{7} }{ \sqrt{7} } = - 15$

$\frac{a + b}{a} \div \frac{ab + {b}^{2} }{ {a}^{2} } = \frac{a + b}{a} \times \frac{a \times a}{b \times (a + b)} = \frac{a}{b}$

Подставляем значения:

1,8 : 0,9 = 2

$(y + 4) \div \frac{ {y}^{2} + 8y + 16}{ {y}^{2} - 16} = \frac{y + 4}{1} \times \frac{(y - 4)(y + 4)}{ {(y +4 )}^{2} } = y - 4$

Подставляем значения:

-2,3-4 = -6,3

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vex14 Благодарю за помощь! Почти все мои ответы с вашими совпали.

But before refrigeration, it was 25_ (considered, thought, judged, believed) a luxury. For many years, people 26 __(produced, did, made, created)

Answer

vex14 April 2023 | 0 Ответы

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But before refrigeration, it was 25_ (considered, thought, judged, believed) a luxury. For many years, people 26 __(produced, did, made, created)

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Part 1. Grammar. Choose the correct answers.1.We sometimes .... tennis on Saturd...

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But before refrigeration, it was 25_____ (considered, thought, judged, believed) a luxury. For many years, people 26 ______(produced, did, made, created)

1 2 3 4 5 642aa7d71294e

1choh 2ch3al4chch 5nahco

vocabularyzaranee blagodarna

part 3 complete the dialogue with the words in the boxpolovina dialoga na foto

part 1 grammar choose the correct answersv 17 our teacher gives us too

1 complete the email with the correct form of the verbs in bracketshi helenbu

since phonedbudu blagodarna za pomosh

part 1 grammar choose the correct answersv nekotoryh ne uverena ot chego tre

Part 1. Grammar. Choose the correct answers.1.We sometimes .... tennis on Saturd...

рекомендуемые вопросы

Helpful Links

Helpful Social

But before refrigeration, it was 25_ (considered, thought, judged, believed) a luxury. For many years, people 26 __(produced, did, made, created)