( 1 )画射线 AB,直线 BC,线段 AC
( 2 )连接 AD 与 BC 相交于点 E.
2,4,3,5,3,5,4,4,3,5
1,5,3,3,2,4,3,5,4,4
4,5,2,3,2,5,4,5,2,3
4,4,3,5,2,4,5,4,3,4