Предмет: Математика, автор: marselov05

на стройку привезли сплав 7 м кубe которого весит 210 кг.Найдите массу сплава объем 9 м кубe

Ответы

Автор ответа: s0807
1
7 м3---------------------------210 кг
9 м3----------------------------х кг

х=9*210/7=270 кг
Автор ответа: Regent1828
1
Плотность сплава:
               ρ = m/V = 210 : 7 = 30 (кг/м³)
Масса 9 м³ сплава:
               m₁ = ρV₁ = 30*9 = 270 (кг)

Ответ: 270 кг.

Или так: 
               7 м³  -  210 кг
               9 м³  -   х кг

       х = 210*9:7 = 30*9 = 270 (кг)

Ответ: 270 кг.
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