Ключевые слова: book, books, calculate, classroom, complex, complicated, concentrated, culture, diagram, draw, equation, exam, examination, finance, formula, graph, information, intelligence, interested, job, know, knowledge, learn, learning, lesson, man, math, mathematic, mathematics, numbers, paper, problem, read, reading, school, searching, sketch, solution, statistics, student, study, studying, teach, teacher, teaching, theory, vintage, work, worker,