a. B, C, D are all real numbers. A group of values (a, B, C, d) which make the inequality AB > CD > 0 and ad < BC hold are______ (just write a set of values suitable for the condition)

This is an open question, just write a correct one, such as (2,1, - 3, - 2). So the answer is: (2,1, - 3, - 2)

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