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nataliyallove
@nataliyallove
July 2022
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найдите значение выражения (2а-5)^2+а(20-5а) при а=-2/5
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Алёнушка1717
Verified answer
(2а-5)²+а(20-5а). Сначала упростим выражение: 4а²-20а+25+20а-5а²=25-а². Теперь найдем его значение при а=-2/5=-0,4: 25-(-0,4)²=24,84. Ответ: 24,84.
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Answers & Comments
Verified answer
(2а-5)²+а(20-5а). Сначала упростим выражение: 4а²-20а+25+20а-5а²=25-а². Теперь найдем его значение при а=-2/5=-0,4: 25-(-0,4)²=24,84. Ответ: 24,84.