сократите дробь: x^2-9/x^2-2x-15. Created by anna12325. algebra-ru

x^2-2x-15...

anna12325 @anna12325

September 2021 1 10 Report

сократите дробь:
x^2-9/x^2-2x-15

Answers & Comments

axatar

Verified answer

Ответ:

$\displaystyle \tt \dfrac{x-3}{x-5}$

Объяснение:

Применим следующие формулы сокращённого умножения:

1) (a-b)·(a+b)=a²-b²;

2) (a-b)²=a²-2·a·b+b².

$\displaystyle \tt \dfrac{x^2-9}{x^2-2 \cdot x-15} =\dfrac{x^2-3^2}{x^2-2 \cdot x+1-16} =\dfrac{(x-3) \cdot (x+3)}{(x-1)^2-4^2} =\\\\=\dfrac{(x-3) \cdot (x+3)}{(x-1-4) \cdot (x-1+4)} =\dfrac{(x-3) \cdot (x+3)}{(x-5) \cdot (x+3)} =\frac{x-3}{x-5} .$

1 votes Thanks 6

raspredelite kakie priznaki otnosyatsya k bezuslovnym refleksam a kakie k uslovnym

Answer

anna12325 July 2022 | 0 Ответы

reshite sistemu uravnenij 3x5y4 3xy

Answer

anna12325 July 2022 | 0 Ответы

reshite pozhalujsta ochen srochnob85c2a71b64768370474f97eee983beb 14546

Answer

anna12325 April 2022 | 0 Ответы

reshite ionnoe uravnenie p2o5koh

Answer

Answers & Comments

Verified answer

reshite ionnoe uravnenie baoh2co2

reshite podrobno x11244x

pomogi pozhalujsta ochen srochno3e38fd04c48760cc1c56273e75b04669 94203

test 1 2 balla dissociiruyut v vodnom rastvore a hlorid kaliya b karbonat

Ae +S=Ae2S2 -------------------- P2O5+C=P+CO...

reshite neravenstvo 6x2 x 2gt0 grafik parabola

raspredelite kakie priznaki otnosyatsya k bezuslovnym refleksam a kakie k uslovnym

reshite sistemu uravnenij 3x5y4 3xy

reshite pozhalujsta ochen srochnob85c2a71b64768370474f97eee983beb 14546

reshite ionnoe uravnenie p2o5koh

рекомендуемые вопросы

Helpful Links

Helpful Social