Помогите упростить... Решение: 5(a+2b)-7(2a-b) при a=-4/9; b=-5/17 - №29800875

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Решение: 5(a+2b)-7(2a-b) при a=-4/9; b=-5/17
- Предмет:
  Алгебра
- Автор:
  tater
- 6 лет назад

Ответы 1

$5(a+2b)-7(2a-b)=5a+10b-14a+7b=-9a+17b$
$-9a+17b=-9*(-\frac{4}{9} )+17(-\frac{5}{17} )=4-5=-1$
- Автор:
  hammermejia
- 6 лет назад
- 0
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Вставьте слова в данные пропуски.
IS ‘NESSIE’ AN ELEPHANT?
1) _____ huge animal is rumoured to 2) _____ living in Loch Ness, in Scotland.
“Loch” 3) _____ a Scottish word meaning “lake”. The water in Loch Ness is deep,
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plesiosaurs were cold-blooded animals, so they could never 9) _____ survived in the
freezing waters of Loch Ness, Recently, it has been suggested that “Nessie” could 10)
_____ an elephant! One expert pointed out that in the past, Nessie 11) _____ often
seen when a famous circus came to Scotland. The circus often stopped at the Loch
12) _____ that the animals could cool down. The elephants often swam in the Loch.
When an elephant is swimming, only 13) _____ long neck and two small humps (part
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