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2、 C D 6 ABC DEC AB=DE ABC DEC A BC=EC B= E B BC=EC AC=DC C BC=DC A= D D B= E A= D 7 1+ 2= A B C D 8 ( ) A x 2 x 1 4B 1 x 2C x xy 1 D x 2 2x 1 9 4 9 17 A 1 B 2 C 3 D 4 10 ABC AD BE F A 3 B 4 C 5 D 6 11 AB=2 D DA=DB E DE CE S =1 A 1 B 2 C 3 D 4 12. 2cm 32cm 2 A 6cm B 5cm C 8cm D 7cm 13 2 2 9 3 m m m A.
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4、 y) 4b 2 (y x) 19 17 18 22. 8 ABC ADE CAD B D EAB DFB DGB 20 23. 8 ABC C AD BAC DE AB AB E F AC BD=DF. 1 CF=EB; 2 AB=AF+2EB 24. ( 2 1 a 2 1 2 a a a=2 (8 ) 22 25. ABC AB=CB D AB E BC BE=BD AE DE DC 1 ABE CBD 2 BDC (12 ) 26 ( 14 ) 1 1 ABC AB=AC m A BD m CE m D E DE=BD+CE 2 2 1 ABC AB=AC D A E m BDA= AEC= DE=BD+CE 3 3 D E D A E m D A E F BAC ABF ACF BD CE BDA= AEC= BAC DEF
