This work comprises of a ampler project in the than he study the ideas ofstudents and professors - of mean level and university- about the mathematicalknowledge, their teaching and learning and explore possible factors that takepart in the failure in Mathematical of the student's. Obtained partial results withstudents of Mean Level are discussed here. In order to carry out ourinvestigation two studies were made: one qualitative and another quantitative.Both studies indicate that the students attribute as task of the professor the one"of explaining" the knowledge in exhaustive and detailed form, and of this theymake depend that they "understands" and they "learns".