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Lera1198
@Lera1198
December 2021
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Помогите прошуууу... 7 задание
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Minsk00
Найти значение выражения 1/a-(a^2-25)/(5a) +a/5 при a =1/3
Решение
Упростим выражение
1/a-(a^2-25)/(5a) +a/5 = 5/(5a) - (a^2-25)/(5a) + a^2/(5a) =
=(5- a^2 +25 +a^2)/(5a) = 30/(5a) =6/a
При a=1/3
1/a-(a^2-25)/(5a) +a/5 = 6/a =6/(1/3) =6*3 =18
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Answers & Comments
Решение
Упростим выражение
1/a-(a^2-25)/(5a) +a/5 = 5/(5a) - (a^2-25)/(5a) + a^2/(5a) =
=(5- a^2 +25 +a^2)/(5a) = 30/(5a) =6/a
При a=1/3
1/a-(a^2-25)/(5a) +a/5 = 6/a =6/(1/3) =6*3 =18