Ответ:
1. 4B + 3O² = 2B²O³
2. B²O³ + 3H²O = 2H³BO³
3. H³BO³ + 3KOH = K³BO³ + 3H²O
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Ответ:
1. 4B + 3O² = 2B²O³
2. B²O³ + 3H²O = 2H³BO³
3. H³BO³ + 3KOH = K³BO³ + 3H²O