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yuliyapetrova
@yuliyapetrova
August 2021
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ПОМОГИТЕ
СРОЧНО
НОМЕР 1А
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dasslerdk
Делаем замену: х^4 =t^2 ,х^2=t.
Получаем уравнение : t^2- 7t -8=0
Решаем квадратное уравнение: D=49+32=81. х1=7+9\2= 8. х2=7-9\2= -1.
Делаем обратную замену: x^2=8 и х^2= -1
Корни: + корень из 8, - корень из 8, 1, -1
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yuliyapetrova
помоги пожалуйста с 3 и 4 тоже
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Answers & Comments
Получаем уравнение : t^2- 7t -8=0
Решаем квадратное уравнение: D=49+32=81. х1=7+9\2= 8. х2=7-9\2= -1.
Делаем обратную замену: x^2=8 и х^2= -1
Корни: + корень из 8, - корень из 8, 1, -1