2/11*13+2/13*15+2/15*17+2/17*19+1/19怎样算简便
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 17:55:46
![2/11*13+2/13*15+2/15*17+2/17*19+1/19怎样算简便](/uploads/image/z/68147-35-7.jpg?t=2%2F11%2A13%2B2%2F13%2A15%2B2%2F15%2A17%2B2%2F17%2A19%2B1%2F19%E6%80%8E%E6%A0%B7%E7%AE%97%E7%AE%80%E4%BE%BF)
2/11*13+2/13*15+2/15*17+2/17*19+1/19怎样算简便
2/11*13+2/13*15+2/15*17+2/17*19+1/19怎样算简便
2/11*13+2/13*15+2/15*17+2/17*19+1/19怎样算简便
原式=(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17-1/19)+1/19=1/11