Решите.
Уч. стр. 47 номер 6.

(3 столб)

∆ это Неизвестное число.

74 : ∆ = 8 (ост ∆)

65 : ∆ = 7 (ост ∆)

85 : ∆ = 9 ( ост ∆)
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