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vladalferov02
@vladalferov02
August 2022
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Решите пожалуйста номер 2
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LFP
Verified answer
Ответ: 2 (√8 ≈ 2.83)
---------------------------
2 votes
Thanks 1
oganesbagoyan
Verified answer
(3)
---
5/(2x² -x -3)
= 5/(x+1)(2x -3) = (2(x+1) - (2x -3) ) / (
x+1)(2x -3) =
2(x+1) / (x+1)(2x -3) - (2x -3) / (x+1)(2x -3) =
2/(2x -3) - 1/(x+1) .
* * * ax² +bx +c =a(x -x₁)(x -x₂) ;
2x² -x -3 =2(x+1)(x -3/2) = (x+1)(2x -3)
* * *
--- или ---
5/(x+1)(2x -3)
= m /(x+1) +n /(2x-3) = (
(2m+n)*x +(-3m+n) ) / (x+1)(2x -3) .
5
≡
(2m+n)*x +
(-3m+n)
{ 2m+n =0 ; - 3m+n =5 . ⇔ { m = -1 ; n =2 .
---------
1 votes
Thanks 1
oganesbagoyan
можете удалить !
vladalferov02
Это правильно?
oganesbagoyan
Да , но ≠ N2
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Answers & Comments
Verified answer
Ответ: 2 (√8 ≈ 2.83)---------------------------
Verified answer
(3)---
5/(2x² -x -3) = 5/(x+1)(2x -3) = (2(x+1) - (2x -3) ) / (x+1)(2x -3) =
2(x+1) / (x+1)(2x -3) - (2x -3) / (x+1)(2x -3) = 2/(2x -3) - 1/(x+1) .
* * * ax² +bx +c =a(x -x₁)(x -x₂) ; 2x² -x -3 =2(x+1)(x -3/2) = (x+1)(2x -3) * * *
--- или ---
5/(x+1)(2x -3) = m /(x+1) +n /(2x-3) = ( (2m+n)*x +(-3m+n) ) / (x+1)(2x -3) .
5 ≡ (2m+n)*x +(-3m+n)
{ 2m+n =0 ; - 3m+n =5 . ⇔ { m = -1 ; n =2 .
---------