Предмет: Алгебра, автор: Soki567

Помогите решить пожалуйста!!!!!!!!!!

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Автор ответа: potroshitelblinov

Х2- это квадрат

1. А квадрат -4 -2а+2а
2.1) 3х(х2у+2х+у3)
2) не знаю
3.2х2-4х+х-2=0
х(2х-2х+1)-2=0
х=2
4. Кол-во стоимость. Всего
альбом 5 шт ?,На 30 больше 460р
Книга 7 шт. ?
Пусть х - стоимость Книги, тогда х+20 - стоимость альбома. Составим и решим уравнение
5(х+20)+7х=460
5х+100+7х=460
12х=360
Х=30 - книга
30+20=60 - альбом
5. 2а2-3аб+2аб2-3б2=(2а-3б)(2а+3б)

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