boolean-operations - Boolean Expressions with DeMorgan’s law

Question

I need help using De Morgan's law to derive an expression that is equivalent to

('A + B + 'C)D but uses only AND and NOT operations (but no OR operation).

Answer 1

首先，('A + B + 'C) = ''('A + B + 'C) = '(A * 'B * C)。
所以结果是，('(A * 'B * C)) * D。