The book consists of five sections: Section I: contains definitions and basic concepts of differential equations, and gives an idea of the value of primary question and the question of the threshold value, Part II: how to contain the formation of differential equations solved when the General known. Then touch on the composition of differential equations to a set of curves Flat, Part III: devoted to a detailed study of patterns to solve some of the famous equations Level I, Part IV: devoted to a thorough study to find a factor of integration, Part V: it devoted to the subject of differential equations written.