I wouldn't consider this really a grammar question, but more of a question of usage. That aside, "speak" and "talk" are often interchangeable, that's true. Nevertheless, "speak" is a bit more formal than "talk".
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Anonymouswhat does this bring us?I think you mean: What does this mean?
AnonymousI have no Idea what you talking 'bout? Is it better to use talk or speak in a school paragraph?