题目

  The Secure Child By Stanley Greenspan, M. D． Publisher: Da Capo Press & Reprint Press Print list price: £5.99 Kindle price: £ 2.99, save £3.00 In this book, Dr. Stanley Greenspan offers a set of guiding principles to help parents of children —from preschoolers to teenagers — so that they feel secure in their homes, their schools, and in the society at large. Building Healthy Minds By Stanley Greenspan, M. D．& Nancy Lewis Publisher： Da Capo Press Print list price： £ 7.99 Kindle price： £ 4. 49, save £ 3.50 The book applies Dr. Greenspan' s developmental th数轴上到原点的距离小于3的整数的个数为x，不大于3的正整数的个数为y，绝对值等于3的整数的个数为z，求：x+y+z的值．