Найдите значение ■: ■ / 13 + 1 ³⁄₁₃ = ²¹⁄₁₃

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📝 Detailed explanation

Переводим смешанную дробь в неправильную: 1 ³⁄₁₃ = (13·1 + 3) / 13 = ¹⁶⁄₁₃.
Решаем уравнение: ■ / 13 + ¹⁶⁄₁₃ = ²¹⁄₁₃.
Так как знаменатели одинаковые, вычитаем числители: ■ = 21 - 16 = 5.
4 / 10 (40%)
Question 4 of 10
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