Решите тест по материаловедению.

https://thriveglobal.com/events/123moviehd-watch-47-meters-down-uncaged-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-escape-from-pretoria-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-birds-of-prey-2020-online-full-movie-free-3/?preview=true

https://thriveglobal.com/events/123moviehd-watch-the-new-mutants-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-knives-out-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-a-quiet-place-2018-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-hereditary-2018-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-free-guy-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-dolittle-2020-online-full-movie-free-2/?preview=true

https://thriveglobal.com/events/123moviehd-watch-jumanji-the-next-level-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-trolls-world-tour-2020-online-full-movie-free-2/?preview=true

https://thriveglobal.com/events/123moviehd-watch-ip-man-4-the-finale-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-the-assistant-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-spies-in-disguise-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-bad-boys-for-life-2020-online-full-movie-free-3/?preview=true

https://thriveglobal.com/events/123moviehd-watch-john-wick-chapter-3-parabellum-2019-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-black-widow-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-digimon-adventure-last-evolution-kizuna-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-the-kings-man-2020-online-full-movie-free/?preview=true

https://thriveglobal.com/events/123moviehd-watch-onward-2020-online-full-movie-free-2/?preview=true

Объяснение:

Первая задача
приводим к общему знаменателю 108 
18/108 зол     24/108 сер  30/108 плат теперь складываем ==72/108
всего 108/108 это 1 часть целая 108/108 -72/108=36/108=1/3 это брил.
ответ:1/3 получил Бриллиантов
во второй задаче находим сколько за час каждый это надо весь забор ,он 1часть разделить на время у нас буде 1й 1/15 2й 1/12 3й 1/10 приводим к общему знаменателю 1800,получаем 120/1800+150/1800+180/1800=1/4 это три рабочих за час.
треть задание
открываем скобки и получаем 12 19/24 - 3 19/24 +5 19/28=9 19/24 +5 19/28=1645/168 + 954/168=15 79/168