Предмет: Математика, автор: romanfeofilov828

Докажите что разность квадратов чисел 102 и 83 делится на 19

Ответы

Автор ответа: Удачник66

Ответ:

Пошаговое объяснение:

102^2 - 83^2 = (102-83)(102+83) = 19*185 = 19*5*37

Оно делится на 19. А ещё на 5 и на 37.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Окружающий мир, автор: Artem7766

обов'язки що я роблю по дому

1 год назад

Предмет: Русский язык, автор: АнгелинаЛи25

Выпишите существительные, имеющие только единственное число, укажите их значение.
1) Корабли долго шли вдоль безжизненной плоской равнины,покрытой солью и ослепительно блестевшей на солнце. На яркой лазури моря были разбросаны дикие скалистые острова.
2) Выбрав удобное место, богатое дичью, путешественники вытащили корабли далеко на берег.
3) Всюду Павлику почёт:
Павлик блинчики печёт.
Он провёл беседу в школе-

Говорил, открыв тетрадь,
Сколько соды,сколько соли,
Сколько масла нужно брать.

1 год назад

Предмет: Английский язык, автор: sblilya

Как правильно переводится этo предложение : " You can`t take your bike inside the shool buildings", "You mustn`t feed the squirrels or tne birds"?

1 год назад

Предмет: Физика, автор: МаринаВин

Какая работа совершается при подъеме гидравлического молота массой 20т на высоту 120см??

7 лет назад

Предмет: Английский язык, автор: TompsonS

Срочно нужна помощь! Пожалуйста
II. Vocabulary and grammar practice.

1. Choose the correct form.
A) Scientists a) have recently identified / have been identifying a new species of animal in the rainforest of Borneo. They b) have been searching / searched for this creature for several years, after reports from local villagers, and say it a type of lemur.
B) Archaeologists in Guatemala c) have found / have been finding a Mayan wall painting which they think is more than 2.000 years old. Archaeologist William Saturno d) explored / has been exploring the site since 2002.
C) Scientists using the Hubble Space Telescope think they e) found / have found two new moons circling the planet Pluto. Astronomers f) have been looking / looked closely at Pluto since 1978 when they g) spotted / have spotted its first moon. The telescope h) worked / has been working for fifteen years, and i) has been producing / has produced more than 700,000 images of the universe.
D) Australian scientists j) have been discovering / have discovered a new coral reef over 60 km long in the Gulf of Carpentaria by using satellites to spot the reefs in deep water. Recently divers k) have managed / have been managing to reach the reefs and take photographs.
2. Choose the correct form.
A) How a) do you get on / are you getting on in Paris? Sorry b) I haven’t written / I’m not writing before but c) I train / I’ve been training hard for my basketball team. We d) played / have played in a tournament last week – we e) come / came third! I really f) enjoy / enjoyed taking part, but g) I haven’t done / I wasn’t doing anything else for the past month.
B) Unfortunately, when Sarah’s big day h) arrived / was arriving, things i) have gone / went disastrously wrong at first. For a start, it j) was raining / has been raining and the traffic was so heavy, she k) arrived / was arriving nearly ten minutes late for the interview. Then while she l) was crossing / has crossed the road, a passing bus m) splashed / was splashing her with water. But inside the building her luck n) changed / has changed. ‘Mr Fortescue o) is expecting / has expected me,’ she p) was telling / told the receptionist. ‘He q) hasn’t arrived / doesn’t arrive yet,’ she was told. ‘Just take a seat.’ Perhaps everything would be all right after all!
C) An art historian r) has discovered / is discovering two missing paintings by Fra Angelico (c 1395 – 1455) in the home of a pensioner from Oxford who s) has died / died earlier this year. Jean Preston t) bought / has bought the paintings when she u) was working / has been working in America in the 1960s. Shortly before her death, a friend v) recognized / has recognized them as part of a group of six small paintings which Angelico w) painted / has painted in 1439. Miss Preston x) paid / was paying about £200 for the pair, but experts y) say / said they are now worth around £1 million.

7 лет назад