出国留学网GRE栏目为大家带来“助考生查漏补缺的新GRE数学易错题”，希望对大家有所帮助! 1 the sum of two numbers, x and y, equals twice their produc
出国留学网GRE栏目为大家提供“GRE数学考试易错题讲解”，希望对大家有所帮助。 1 the sum of two numbers, x and y, equals twice their products. if x=