教育家蒙台梭利认为：“要教育幼儿就要了解幼儿，而观察幼儿正是了解幼儿的主要途径之一，是教师进行有效指导的前提。”该人士认为，只有最后能够变现，才能够落袋为安。
菜多多蔬菜配送下载此外，本届大会继续举办“西湖对话”活动，主题是“荟人才、建名城，在杭州、联世界”，希望借亚运之势，赓续历史文脉，推动国际人文、科技交流和传播，打造城市现代文明的人文交流载体。 许建平简要介绍了兰州银行在临夏州业务开展情况。
(1-1/2)+(1/2-1/3)+(1/3-1/4)+···+（1/2009-1/2010 To find the sum of the given series, we need to add all the terms together. (1 - 1/2) + (1/2 - 1/3) + (1/3 - 1/4) + ... + (1/2009 - 1/2010) We can simplify each term by finding the common denominator. 1 - 1/2 = 2/2 - 1/2 = 1/2 1/2 - 1/3 = 3/6 - 2/6 = 1/6 1/3 - 1/4 = 4/12 - 3/12 = 1/12 We can observe that each term follows this pattern - the denominator of the second fraction becomes the denominator of the first fraction in the next term. So, the series can be written as: 1/2 + 1/6 + 1/12 + ... + 1/2009 To find the sum of this series, we need to find the common denominator of all the fractions. The common denominator of 2, 6, 12, ..., 2009 will be the least common multiple (LCM) of these numbers. Calculating the LCM of these numbers is a bit lengthy. Instead, we can find the LCM of 2, 3, 4, ..., 2010, and then divide by the LCM of 2, 3, 4, ..., 2009. LCM(2, 3, 4, ..., 2010) / LCM(2, 3, 4, ..., 2009) = 2010 / 2 = 1005 So, the common denominator is 1005. To add the fractions, we need to express them with the common denominator: 1/2 = (1/2) * (1005/1005) = 1005/2010 1/6 = (1/6) * (1005/1005) = 167.5/2010 1/12 = (1/12) * (1005/1005) = 83.75/2010 Now we can add: 1005/2010 + 167.5/2010 + 83.75/2010 + ... + 1/2009 We can observe that the denominators of the fractions form an arithmetic sequence, and the numerators follow the same pattern. Using the formula for the sum of an arithmetic sequence: Sum = (first term + last term) * number of terms / 2 In this case, the first term is 1005/2010, the last term is 1/2009, and the number of terms is 2010. Sum = (1005/2010 + 1/2009) * 2010/2 Sum = (1005/2010 + 1/2009) * 1005 Sum = (1005 * 2009 + 1 * 2010) / 2 Sum = (2019955 + 2010) / 2 Sum = 2021965 / 2 Sum = 1010982.5 Therefore, the sum of the given series is 1010982.5.东方财富Choice数据显示，截至11月14日，年内同业存单总发行量约22.06万亿元，较去年同期增长27.07%。初贵妃想不明白，明明李同光总是跟她说甜言蜜语，也时常与她秘密见面，为何不愿意跟她进一步亲近？没过多久，侍从来报，李同光和丫鬟在帐篷里亲近，被人撞了个正着。