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анонимПрежде чем мы найдем значение выражения 5b - 4(0,8 - b) + 2,3 при b = 0,3 откроем скобки и выполним группировку и приведение подобных слагаемых.
Для открытия скобок будем использовать распределительный закон умножения относительно вычитания и правило открытия скобок перед которыми стоит знак минус.
Откроем скобку и получим:
5b - 4(0,8 - b) + 2,3 = 5b - 4 * 0.8 + 4 * b + 2.3 = 5b - 3.2 + 4b + 2.3 = 5b + 4b - 3.2 + 2.3 = 9b - 0.9.
При b = 0.3 выражение принимает значение:
9 * 0.3 - 0.9 = 2.7 - 0.9 = 1.8.
Ответ: 1,8.
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samantha15Добавить свой ответ
Fill the SECOND gap with one of the following phrases: numerous sightings, observations, beast, is supposed to, supposedly, splashing, fake.
Примечание: Заполните ВТОРОЙ пропуск. Вставьте одно слово из списка: numerous sightings, observations, beast, is supposed to, supposedly, splashing, fake. В ответе напишите выбранные слова через запятую. Точку в конце ставить не нужно. Обратите внимание на образец оформления ответа.
Example answer: numerous sightings
6)Over the centuries the legend of the Loch Ness monster has never gone away. In the 1930s a new road was built along the shore of Loch Ness. In 1933, a couple who was driving along this road reported an enormous animal (1) ________ on the surface of the lake. In the following months newspapers sent reporters and photographers to the lake to make (2) ________. Even footprints of an enormous animal were found.
Fill the gap with one of the following phrases: numerous sightings, observations, beast, is supposed to, supposedly, splashing, fake.
Примечание: вставьте пропущенное слово из списка: numerous sightings, observations, beast, is supposed to, supposedly, splashing, fake. В ответе напишите выбранное слово. Точку в конце ставить не нужно. Обратите внимание на образец оформления ответа.
Example answer: observations
7)Many books were written about the monster of Loch Ness. Several photographs made it to the front pages of the newspapers. The most famous photograph came from a British surgeon in 1934. Robert Wilson, a London doctor, took a photo of a creature with a long neck that stood out of the water. In 1975 the Sunday Telegraph proved that this photo was _______.
Choose the right forms of the verbs to fill in the gaps.
9)By six o'clock father ______________ home and at six he __________________ dinner.
• had come, was having
• came, had
• was coming, had had
Choose the right forms of the verbs to fill in the gaps.
10)By nine o'clock yesterday grandmother _____________ the dishes and at nine she _____________ TV.
• was washing, had watched
• had washed, was watching
• washed, was watching
Choose the right forms of the verbs to fill in the gaps.
11)By eight o'clock yesterday I _______ my homework and at eight I _______ the piano.
• had done, played
• had done, was playing
• did, was playing
Choose the right forms of the verbs to fill in the gaps.
12)By eight o'clock yesterday I _______ my homework and at eight I _______ the piano.
• had done, played
• had done, was playing
• did, was playing
13)Choose the right forms of the verbs to fill in the gaps.
When I _____ Tom, he _____ an ice cream which he _____ at the corner of the street.
• had met, was eating, bought
• met, ate, had bought
• met, was eating, had bought
14)Choose the right forms of the verbs to fill in the gaps.
When father _____ home, we _____ the mushrooms which we _____ in the wood.
• had come, were cooking, had gathered
• came, were cooking, had gathered
• came, had cooked, gathered
15)Choose the correct verb form to complete these sentences.
1) He ...... documents by the time the boss came.
• prepared
• had prepared
2) I never ...... my grandmother. She died before I was born.
• knew
• had known
3) He's in hospital because he ...... his leg one hour ago.
• had broken
• broke
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