1/3+1/15+1/35+1/63+1/99+1/143的简便算法(写过程)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/06 21:56:22
1/3+1/15+1/35+1/63+1/99+1/143的简便算法(写过程)
![1/3+1/15+1/35+1/63+1/99+1/143的简便算法(写过程)](/uploads/image/z/13109882-50-2.jpg?t=1%2F3%2B1%2F15%2B1%2F35%2B1%2F63%2B1%2F99%2B1%2F143%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%EF%BC%88%E5%86%99%E8%BF%87%E7%A8%8B%EF%BC%89)
原式=1/1*3+1/(3*5)+1/(5*7)+1/(7*9)+1/(9*11)+1/(11*13)
=1/2(1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9-1/11)+1/2(1/11-1/13)
=1/2(1-1/13)=6/13
=1/2(1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+1/2(1/7-1/9)+1/2(1/9-1/11)+1/2(1/11-1/13)
=1/2(1-1/13)=6/13
1/3+1/15+1/35+1/63+1/99+1/143的简便算法(写过程)
1/3+1/15+1/35+1/63+1/99+1/143+1/195+1/255的值是() 要求有简便算法的过程
数学简便算法←_←8分之1+15分之8+8分之7-15分之3PS「简便算法 写过程」
5.29/2.3-0.1X0.1简便算法0.28/35简便算法 84.68/4.5X(0.25+0.5)简便算法
1/15+1/35+1/63+1/99+1/143+1/195的简便算法
简便算法;过程,3/2-15/4乘以1/10减去5/8谢谢了,
1+2+3+4+…+99的简便算法
求(1/18)/(2/3+1/6-1/2)的简便算法(拖式计算要过程)
59/78+1/77的简便算法
(3.14+2.6)×(1-0.75)的简便算法
9990*200.8+1*2008的简便算法
0.59*99用简便算法,列脱式!1