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เนื้อหาย่อ : R. Robert Rosenberg. The thousands of teachers who have taught from one or more of his books need no introduction to R. Robert Rosenberg, leading author in business mathematics and business law. His books have been used throughout the 50 states and in many foreign countries. One of his business mathematics textbooks has been translated into Spanish; and there is a Canadian edition of another. Doctor Rosenberg has taught in all types of institutions including high school, university, business school, and junior college. He has held administrative positions on the elementary, high school, and collegiate levels (most recently he was President of Jersey City Junior College). He is currently Educational Consultant to the Jersey City Bosrd of Education in Jersey City, New Jersey. Doctor Rosenberg is a C.P.A; his Ed.D. in administration and supervision of business education was earned at New York University. Harry Lewis. No newcomer to the field of business mathematics, Dr. Harry Lewis is Head of the Mathematics Department of East Side High Sebool, Newark, New Jersey. Doctor Lewis is coauthor of the previous of this book. He has taught mathematics to business and nonbusi- dents in secondary schools and special advanced courses to "'on-the- job ployees. His teaching experience also included methods courses in tics in colleges and universities. Doctor Lewis is author of numer- 0us gazine articles on mathematics and the teaching of mathematics; he is also suthor of a high school geometry textbook soon to be released by another publisher. He received his Ph.D. in mathematics education from New York University.