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madike
@madike
August 2022
2
10
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С РЕШЕНИЕМ-ЛУЧШИЙ ОТВЕТ,СПАМ,ФЛУД-НАРУШЕНИЕ.ПИШУ ТАК,КАК НАПИСАНО В УЧЕБНИКЕ.
(/ - дробная черта).Найдите значение выражения:
1-81b²/a²-25 * a+5/9b+1 - 1/a-5 при а=0,b=-2,5
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Pacanka202
1 votes
Thanks 1
madike
Спасибо.Завтра лучший ответ!
zhenyaM2002
Verified answer
1–81b^2 a+5 1
------------- • -------- – ------ =
a^2–25 9b+1 a–5
(1–9b)(1+9b)•(a+5) 1
= ------------------------- – ------ =
(a–5)(a+5)•(9b+1) a–5
1–9b 1 1–9b–1 9b
= -------- – ------ = ----------- = – ------ =
a–5 a–5 a–5 a–5
9•(-2,5)
= – ----------- = – 4,5
-5
0 votes
Thanks 0
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Answers & Comments
Verified answer
1–81b^2 a+5 1------------- • -------- – ------ =
a^2–25 9b+1 a–5
(1–9b)(1+9b)•(a+5) 1
= ------------------------- – ------ =
(a–5)(a+5)•(9b+1) a–5
1–9b 1 1–9b–1 9b
= -------- – ------ = ----------- = – ------ =
a–5 a–5 a–5 a–5
9•(-2,5)
= – ----------- = – 4,5
-5