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hux
@hux
October 2021
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7задание под буквами б и г
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iriska124
Б) х*(х²-2х)=х³-8
х³-2х²=х³-8
-2х²=-8
х²=4
х1=2
х2=-2
Ответ---- (х1=2,х2=-2)
г)(х+7)*(х-7)+(х-3)²=53
х²-7х+7х-49+х²-6х+9=53
2х²-6х-40-53=0
2х²-6х-93=0
Д=36-4*(-93)*2=780
х1=6-√780\4=1\2*(3-√195)
х2=6+√780\4=1\2*(3+√195)
Ответ----(х1=1\2*(3-√195);х2=1\2*(3+√195))
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Answers & Comments
х³-2х²=х³-8
-2х²=-8
х²=4
х1=2
х2=-2
Ответ---- (х1=2,х2=-2)
г)(х+7)*(х-7)+(х-3)²=53
х²-7х+7х-49+х²-6х+9=53
2х²-6х-40-53=0
2х²-6х-93=0
Д=36-4*(-93)*2=780
х1=6-√780\4=1\2*(3-√195)
х2=6+√780\4=1\2*(3+√195)
Ответ----(х1=1\2*(3-√195);х2=1\2*(3+√195))