They are often interchangeable, but there are certain expressions that go with one rather than the other. For example you speak a language.
Also, speak is a little bit more formal.
Hope that helps :)
21 Eylül 2014
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Talk is a two-direction conversation, for example with your friends. Speak is a one-direction conversation, for example a lecturer or radio presenter.
21 Eylül 2014
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!