问个简单的问题,偶不会算
nba23 2004-09-23 10:21:41 有10个全等三角形,组合如下,问其中暗藏了多少个四边形?
# # # # # # # # # # # # # # # # # # # # # # # # # # # #
# # # # # # # # # # # #
# # # # # # # # # # # #
# # # # # # # # # # # # #
# # # # # # # # # #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# # # # # # # # # #
# # # # # # # # # # #
# # # # # # # # # #
# # # # # # # # #
# # # # # # # # # # # # # # # # # # ## # # # # #