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madem
@madem
July 2022
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Помогите сделать номер 997
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Мавортий
Х^2-9х-17=0
а)х1+х2=9 (х1+х2)^2=81 х1^2+2х1*х2+х2^2=81 х1^2+х2^2=81+34=115
х1*х2=-17. 2х1*х2= -34 2х1*х2= -34
Ответ:х1^2+х2^2=115
б)х1+х2=9 (х1+х2)(х1*х2)= -153. х1^2х2+х1х2^2= -153
х1*х2= -17
Ответ: х1^2х2+х1х2^2= -153
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Answers & Comments
а)х1+х2=9 (х1+х2)^2=81 х1^2+2х1*х2+х2^2=81 х1^2+х2^2=81+34=115
х1*х2=-17. 2х1*х2= -34 2х1*х2= -34
Ответ:х1^2+х2^2=115
б)х1+х2=9 (х1+х2)(х1*х2)= -153. х1^2х2+х1х2^2= -153
х1*х2= -17
Ответ: х1^2х2+х1х2^2= -153