证明:
将FC.FC=FA.FE化成FA/FC=FC/FE
B:AD//BC
S:ADF~CBF
S:FA/FC=FD/FB
B:BE//CD
S:FEB~FCD
S:FD/FB=FC/FE
S:FA/FC=FC/FE
(“B”因为,“S”所以,“.”乘.)
证明:
将FC.FC=FA.FE化成FA/FC=FC/FE
B:AD//BC
S:ADF~CBF
S:FA/FC=FD/FB
B:BE//CD
S:FEB~FCD
S:FD/FB=FC/FE
S:FA/FC=FC/FE
(“B”因为,“S”所以,“.”乘.)