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katsnegurka
@katsnegurka
July 2022
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(a-1)^2+2(a-1)+1=a^2 докажите тождество
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Checov7400
(a-1)²+2(a-1)+1
(a-1)=t ⇒
t²+2t+1=(t+1)²=(a-1+1)²≡a².
5 votes
Thanks 2
sangers1959
Verified answer
А²-2а+1+2а-2+1=а²
а²-2а+2а+1-1=а²
а²=а²
3 votes
Thanks 3
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Answers & Comments
(a-1)=t ⇒
t²+2t+1=(t+1)²=(a-1+1)²≡a².
Verified answer
А²-2а+1+2а-2+1=а²а²-2а+2а+1-1=а²
а²=а²