Предмет: Математика, автор: Valeriya274765

Помогите решить 1) Сплав складається з олова, міді та сурми, взятих у відношенні 1:2:5. Скільки грамів сурми у сплаві, якщо міді в ньому 6,8г? Яка маса сплаву? 2) У коробці лежить 10 карток, занумерованих числами від 1 до 10. Знайдіть імовірність того, що навмання вибрана картка матиме номер, на якому буде парне число.

Ответы

Автор ответа: yanalink

1+2+5=8 частей весь сплав

1 часть олова

2 части меди

5 частей сурьмы

6,8*5/2=17г сурьмы

6,8*8/2=27,2г весь сплав

5 четных чисел 2.4.6.8.10 вероятность 510=12

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