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ilyinavlada
@ilyinavlada
August 2021
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Помогите пожалуйста! 20 баллов
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sedinalana
Verified answer
(1-a)/(1-a+a²)-2/(1+a)+(-3-7a+2a²)/([(1+a)(1-a+a²)]=
=(1-a²-2+2a-2a²-3-7a+2a²)/[(1+a)(1-a+a²)]=(-a²-5a-4)/(1+a³)=
=-((a+1)(a+4)/[(a+1)(a²-a+1)]=-(a+4)/(a²-a+1)=(a+4)/(a-a²-1)
----------------------------------------------------------------------------------
-a²-5a-4=0
a²+5a+4=0
a1+a2=-5 U a1*a2=4
a1=-1 U a2=-4
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Answers & Comments
Verified answer
(1-a)/(1-a+a²)-2/(1+a)+(-3-7a+2a²)/([(1+a)(1-a+a²)]==(1-a²-2+2a-2a²-3-7a+2a²)/[(1+a)(1-a+a²)]=(-a²-5a-4)/(1+a³)=
=-((a+1)(a+4)/[(a+1)(a²-a+1)]=-(a+4)/(a²-a+1)=(a+4)/(a-a²-1)
----------------------------------------------------------------------------------
-a²-5a-4=0
a²+5a+4=0
a1+a2=-5 U a1*a2=4
a1=-1 U a2=-4