Предмет: Алгебра, автор: Thelamar

Докажите неравенство
(a-4)^2 >a(a-8)

Ответы

Автор ответа: WhatYouNeed
45

(a-4)² > a(a-8)

Упростим:

a²-8a+16 > a²-8a

Отнимем от обеих частей a²-8a

16 > 0

Это всегда верно. Значит, предыдущие неравенства тоже верные. В том числе и первое неравенство

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The Present Simple vs. the Present Continuous



Task I. Mark the sentences with the verbs in the Present Simple tense.

⦁ Mike is from the USA.

⦁ Mike is talking to his mum.

⦁ Indira often cooks delicious Indian food for her friends.

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⦁ We enjoy taking part in the international Explorers` club.


Task II. Mark the sentences with the verbs in the Present Continuous tense.

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⦁ He is attaching some photos to his letter.

⦁ Carlos often writes e-mails to his family.

⦁ Carlos is leaving in two days.

⦁ He lives in Portugal.


Task III. Look at the picture and choose the needed form of the verb.

1. You (to see) ... my new friends in the picture.

⦁

⦁ see

⦁ are seeing


2. You (to see) ... that Sally (to sing) ... in the photo.

⦁

⦁ see, sing

⦁ are seeing, is singing

⦁ see, is singing


3. In the picture Rick from Australia (to play) ... the guitar. It (to be) ... his hobby.

⦁

⦁ plays, is being

⦁ is playing, is

⦁ plays, is


Task IV. Match the beginning of the sentence with its ending.

⦁ Jessica takes part

⦁ My new friend Marco likes

⦁ Vanessa is calling her

⦁ Nikita sends e-mails to his

⦁ We discover a lot of interesting facts ⦁ mum every evening.

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⦁ mum now.


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