Предмет: Алгебра, автор: robertvalentine1213

Преобразуйте квадрат двучлена в многочлен стандартного вида;
1) а) (3x-7)2; б) (7x+9)2 в) (a+b) (a-b)

2) Упростите выражение:
а) (x-1)(3+x)-(x-2)²
б) 5(a+b)²-10ab
в) (c+3)(c²-3c+9)-c³

3) Найдите значние алгебраического выражения:
(12x³-6x²y):6x2 при x=5; y=-4

Прошу помочь, даю 45 баллов.

Ответы

Автор ответа: qurilishmchj
1

Ответ:

1) а. 6x-14. б. 14x+18. в. a²-b²

2) a. 3x+x²-3-x-x²+4x-4=6x-7

б. 5a²+10ab+5b²-10ab=5a²+5b²

в. с³+27-с³=27

3) 2x-y=10+4=14.

Похожие вопросы
Предмет: Английский язык, автор: annkuz
Вставьте пропущенные слова: was, left, started, has been, went

Angela Thomas (1) was born in Bristol in the south-west of England. She (2) started school when she (3) _______ years old. She (4) ____ has been ____ at school for twelve years. When she (5)  _________ school she (6) _______________ to the London College of Medicine. She (7) ____________ there for eight years. Then she (8) _______________ the College and (9) _______________ her work as a doctor in a London hospital. She is still in London. She (10) ____________ there for twelve years. She is still a doctor in the
same hospital, too. She (11) ____________ a doctor there for four years now.


Закончите вопросы, используя слова: when, how old, where, how long. Напишите также ответы.
(1)  Where was Angela born? – In (2) Bristol.
(2)  ____________ in Bristol?  - It’s in the (4) _____________ of (5) ___________
(6) __________ did Angela start school? When she was (7) _____________ years old.
(8) __________ was she at school? For (9) _______ years.
(10) _________ was she when she left school?
She was (11) __________ years old.
(12) ____________ was she at medical college?
For (13) _________ year.
(14) __________ did she start work as a doctor?
When she was (15) _____________ years old.
(16) _________ has she been in London?
For (17) ___________ years.
(18) _____________ has she been a doctor at the hospital?
For (19) _________ years.
(20) ________ she is now? She is (21) ___________ years old. 
Предмет: Математика, автор: Настяmndjjsjsjdjsj
Предмет: Математика, автор: muxammad25