ГДЗ Задачник по математике 6 класс Бунимович

ГДЗ Задачник по математике 6 класс Бунимович

авторы: .
издательство: "Просвещение"

Раздел:
  • ЧАСТЬ 1. ЗАДАЧИ И УПРАЖНЕНИЯ
  • Действия с десятичными дробями
  • Все действия с десятичными дробями

ГДЗ задачник по математике 6 класс Бунимович. Все действия с десятичными дробями. Номер №340

Душевая имеет длину 3,5 м и ширину 2,5 м. Стены высотой 2,5 м требуется обложить плитками, исключая окно и дверь, которые занимают 0,1 площади стен. Сколько требуется плиток квадратной формы со стороной 25 см?

Решение

1) 2 * (2,5 * 3,5) + 2 * 2,5 * 2,5 = 2 * 2,5 * (3,5 + 2,5) = 5 * 6 = 30
( м 2 )
− площадь стен, включая площадь окон и дверей;
2) 30 * 0,1 = 3
( м 2 )
− площадь окон и дверей;
3) 303 = 27
( м 2 )
− площадь стен, которую нужно покрыть плиткой;
4) 25 * 25 = 625
( с м 2 )
= (625 : 10000)
( м 2 )
= 0,0625
( м 2 )
− площадь одной плитки;
5) 27 : 0,0625 = 432 (плитки) − потребуется для покрытия стен.
Ответ: 432 плитки
 
Вычисления:
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