bian fu
2 ge AB=CD
xian kong ,hou duo
kan tu
hu die mo shi ,ke bo hui tiao
2168 jie gou qu shi xian fa ya
tou jian ding san jiao xing zheng li
AB=CD jie gou
bian fu mo shi ,die po zhong yao zhi cheng zuo kong
duo kong dou ba wo hao
hui cai zuo duo
zuo kong
bian fu hui cai jing xian le
zhong jie xie xing
zhi cheng ,RSI bei li
zhong jie xie xing , tu po qu shi xian ,zuo duo