[理工] 线代 黄子嘉 5-66

楼主: aromaraz (willychang17)   2018-11-03 15:08:04
想请问是如何得知 0<d<1 ,0<c<1的?
https://i.imgur.com/5VEiJgi.jpg
作者: wei12f8158 (WEI)   2018-11-03 15:15:00
题目给a+c=b+d=1,且abcd都为正
楼主: aromaraz (willychang17)   2018-11-03 15:52:00
干哈哈没看到抱歉

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