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wow790
1. угол 7 равен углу 5 (вертикальные углы)

угол 1 равен углу 3 (вертикальные углы)

2.т.к. угол 1=углу 7, то угол 5=углу 3. угол 5 и угол 3 внутренние накрест лежащие,зн., а и б параллельны

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