В каком случае использовано сочетательное свойство сложения?
а) 65 + 24 = 65 + 20 + 4
б) (60 + 5) + (20 + 4) = (60 + 20) + (5 + 4)
в) 65 * 24 = 65 * 20 * 4
г) (65 + 24) * 2 = 65 * 2 + 24 * 2
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