1/2+1/6+1/12+1/20
=1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=4/5
猜你喜欢
- 1一只挂钟的分针尖端到钟面中心的距离是15厘米,经过1小时,该分针的尖端走过的程是多少厘米?
- 2把刻舟求剑翻译成白话文
- 3已知三角形ABC的斜边长AB=10cm,斜边的中线CD长5cm,周长为24cm,求三角形的直角边
- 4y=1/2sin(π/3-2x/3)的单调区间
- 51毫米等于多少纳米?
- 6什么是化学平衡转化率
- 7解释安居乐业
- 8Every possible measure have been taken by the government to prevent the riving from being polluted
- 9请你改正诗句引号内的错字,并每个猜一条成语
- 10从上海开往广州的一列快车,每小时行85千米;另一列慢车从广州开往上海,每小时行60千米.两列火车相遇前1个小时两车相距多少千米?