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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. 高举监管执法“利剑”,全面推进依法行政,综合运用质量、价格、信用、计量、标准、广告、知识产权、认证认可、反不正当竞争等手段,全面加大消费环境执法力度,深入开展民生领域“铁拳”行动,严厉打击各类消费侵权行为。此外,百时美施贵宝来自外部的研发管线占比达 60%,在全球更是拥有超过300个活跃的联盟伙伴。
不用泡打粉的开口馒头,只要一个简单手法,个个开花、香甜松软 材料:
- 300克中筋面粉
- 150毫升温水
- 5克干酵母
- 5克糖
- 3克盐
- 适量食用油
步骤:
1. 在一个大碗里,将温水和酵母搅拌均匀,让酵母充分激活。
2. 将面粉、糖和盐加入碗中,用筷子搅拌至面团开始成形。
3. 把面团倒在光滑的台面上,用手揉搓面团约10分钟,直到面团光滑、有弹性。
4. 将面团放回碗中,盖上湿布或保鲜膜,放在温暖的地方发酵1小时,或直到面团两倍大。
5. 取出发酵好的面团,轻轻用手排气。
6. 将面团分成适量的小面团,每个面团约30克。
7. 取一个小面团,在手心轻轻滚动成球形,并用手指在中间按下,留下一个小坑。
8. 用拇指和食指夹住面团边缘,然后旋转2-3圈,使面团边缘起皱,形成一个小花瓣。
9. 将开好的馒头放在烤盘上,然后重复操作直到所有面团都开好。
10. 盖上湿布或保鲜膜,再次放在温暖的地方发酵30分钟,直到馒头变蓬松。
11. 在馒头上刷一层薄薄的食用油。
12. 预热烤箱至200°C,将烤盘放入烤箱中烤10-12分钟,或直到馒头变金黄色。
13. 取出馒头,用湿毛巾盖上让其稍微冷却。
14. 打开馒头即可食用,可以外面蘸点酱油或蘸粥吃。
小贴士:
- 确保面团发酵时的环境温暖,可以加快发酵的速度。
- 盖上湿布或保鲜膜是为了防止面团表面干燥,有助于发酵。
- 使用食用油刷在馒头表面可以帮助提升外观和口感。 还有党员提出,村里有古柳树,河里有石头,山里能种茶,希望能发展农文旅项目,有更多在家门口就业的机会…… 阳平镇将为民办实事、解难事,群众满意不满意,作为检验主题教育的出发点和落脚点。 8.优化公积金服务。
最全的免费追剧软件不用会员 本文转自:新余日报 抢抓黄金期 决战四季度 分宜水利工程建设正酣 本报分宜讯 通讯员华安 曾宏宇报道:秋冬季节是水利建设大干快上的黄金期。 11月27日讯在本轮意甲进球后,迪巴拉作出了闭嘴的手势,而《罗马体育报》解释了迪巴拉这么做的原因。