Предмет: Математика, автор: Свонг

помогите с 131 номером

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Автор ответа: alena1102002

1) 70 см3 - 735 г
   25см 3 - х г , отсюда

   х=25*735/70
   х=262,5 г
2)70 см3 -735 г
   х см3 - 420 г, отсюда
   х=70*420/735
   х=40 см3

Автор ответа: Свонг

молодец! а я так долго мучился!

Автор ответа: qweq711

735:70=10.5(граммов) весит 1 см³ серебра
25*10.5=262.5 (граммов) в 25см³ серебра
420:10.5=40 (см³) в 420 граммах

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