拜托了~一道简便运算

来源：百度知道 编辑：UC知道 时间：2024/06/07 22:29:22
http://hiphotos.baidu.com/tloveyue/pic/item/263959fb295214314e4aea7f.jpg
大家去看看~这是我用画图弄成的~·~~这道题好难啊~~大家帮帮我吧~~~
要详细过程谢谢！！

https://gss0.baidu.com/7LsWdDW5_xN3otqbppnN2DJv/sun068013/pic/item/841cb3daafd443c8b7fd486f.jpg

等于 5

原式为5/(1-2/7)/(1-2/(2+3/(1-2/5)))
=5/(5/7)/(1-2/(2+3/(3/5)))
=5/(5/7)/(1-2/(2+5))
=5/(5/7)/(1-2/7)
=5/(5/7)/(5/7)
=5/1
=5