21.22.23.24.25.26.27.28.29.这九个数每行三个,横坚.都得75怎么解

问题描述:

21.22.23.24.25.26.27.28.29.这九个数每行三个,横坚.都得75怎么解

28 21 26
23 25 27
24 29 22