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раціональні числа

розкриття дужок

QuestionAnswer
Щоб перемножити два числа з різними знаками, потрібно: перемножити модулі цих чисел; перед отриманим числом поставити знак «−».
Щоб перемножити два від'ємні числа, потрібно: перемножити їх модулі.
Добуток двох від'ємних чисел- Число додатне.
Коли добуток дорівнює нулю? якщо хоча б один із множників дорівнює нулю.
Добуток декількох множників, відмінних від нуля число від'ємне
Created by: Ruslan Solomon
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