Предмет: Математика, автор: sezim200408

7 (a×в-3)-4 (а×в-5)+1

Ответы

Автор ответа: andreevnaelina

7аb-21-4ab+20+1=0
3ab=21-20-1
3ab=0
ab=0
a=0 или b=0

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