Предмет: Алгебра, автор: kseniavygodanskaya

(a-1)²+2(a-1)+1=a²
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Ответы

Автор ответа: melya52

1

Объяснение:

a^2-2a+1+2a-2+1-a^2=0

0=0, значит а - любое число

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