∴A'B = AA'= AC..................................( 1)

B = A 'B AB = 3

AC = 6..............................( 1)

RT△ABC

........................ (2 points)

(2)RT△ADC∴

∵

.......................................( 1)

∵..............................( 1)

It is easy to prove that △AOF∽△ABC

................................( 1)

Same. .............................( 1)

∴

∴

:()。 .................(2 + 1)

After two rounds of .................... (1) tangent.

(Truncated) .............................. (1)

∵

It doesn't exist, so the tangent queen .............................. (1).

Solve this problem? 200 1 year.