2016-05-17 | 0
2016-05-18 | 0
2016-05-20 | 0
A.在AB上取一点C,使AC=BC
B.在AB的延长线上取一点C,使BC=AB
C.在BA的延长线上取一点C,使BC=AB
D.在BA的延长线上取一点C,使BC=2AB
2016-05-21 | 0
2016-05-24 | 0
2016-05-26 | 0