Предмет: Математика, автор: sbelechenka

Помогите пожалуйста задача на дробь. Мама купила в магазине большой пирог с рыбой. Утром первым проснулся Толя и съел 1/20 часть пирога .Через час после Толи проснулись Оля и Вася они вместе съели одну 5 часть пирога. В обед пришёл папа и съела ещё одну четвертую часть пирога. Какую часть пирога съели. А сколько весил весь пирог если сьели 800 грамм

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Автор ответа: Zombynella

10

Ответ:

В решении.

Пошаговое объяснение:

Мама купила в магазине большой пирог с рыбой. Утром первым проснулся Толя и съел 1/20 часть пирога .Через час после Толи проснулись Оля и Вася они вместе съели одну 5 часть пирога. В обед пришёл папа и съел ещё одну четвертую часть пирога. Какую часть пирога съели. А сколько весил весь пирог, если съели 800 граммов.

1) 1/20 + 1/5 + 1/4 =

= 1/20 * 1/5*4/4 + 1/4 * 5/5 =

= 1/20 + 4/20 + 5/20 = 10/20 = 1/2 (пирога съели)

2) 1/2 пирога - 800 гр;

вес всего пирога: 800 * 2 = 1600 (гр.).

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