Ключевые слова: add, algebra, assignment, background, calculate, calculation, calculus, classroom, college, complicated, concept, desk, divide, education, equation, exam, exercise, formula, fraction, homework, knowledge, learn, lesson, math, mathematics, numbers, parameter, plus, problem, quantity, question, root, school, science, sign, solution, solve, square, stationery, student, study, subject, subtract, symbol, test, theory, training, university,