~DODG=DOCE , ??BDC??ODG??ACB??OCE, ??HDC??ECH, ~ EH^BC , ??EHC??HCD?90?
??CHE ~ ?DCH, ?EHHCHC?CD ?HC2?EH?CD,
?x2?(1?x)?1,
解得 x?5?12或 x??5?12?HC?5?12
舍弃 ) , (
~DODG=DOCE , ??BDC??ODG??ACB??OCE, ??HDC??ECH, ~ EH^BC , ??EHC??HCD?90?
??CHE ~ ?DCH, ?EHHCHC?CD ?HC2?EH?CD,
?x2?(1?x)?1,
解得 x?5?12或 x??5?12?HC?5?12
舍弃 ) , (