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4、15 21 30m 24m 480 m 2 m 22. 1 1 x y x k y 2 k k A m, 2 . 1 A 2 x0 y1 y2 . ( ) 3 9 27 ) . 23. AB=AC AD=AE DE=BC BAD= CAE (1) BAE CAD (2) BCDE 24. 1 AC=8m BC=6m P C 2m/s A Q B 1m/s C 1 _ 24 30 D E B A C 2 1 D C A A C P P B Q B Q 2 3 2 CD PQ CD 25. ) ( 0 x x k y OAB A OB C AB x A 2 3 1 k 2 D 3 m AD 3 O
5、AB 2017 15 _ 3 30 1 2 3 4 5 6 7 8 9 10 B A B C B A A D C C 4 24 11. 2:3 12. -3 1 13. x y 6 14. 800 15. 12 16. (4,1) 3 6 18 17. a=2, b=3, c=-1 17 8 9 ) 1 ( 2 4 3 4 2 2 ac b 0 .2 2 2 17 3 x .4 4 17 3 1 x 4 17 3 2 x .6 18. 1 2 1 19. .1 1 2 3 1 1 1 1 2 1 3 2 2 1 2 2 2 3 3 3 1 3 2 3 3 .3 9 .4 3 1 1 2 2 3
6、 3 .5 P 3 1 9 3 .6 ( ) 3 7 21 ) 20. 1 CE AB BF 1 1 3 2 AB BF x 2 3 5 4 x . .5 3 x .6 AB 3 .7 21. x .1 30 3x 24 2x =480 .4 x1=20 x2=2 .6 2m .7 22. 1 1 1 x y A m,2 , 2=m+1. m=1. A A 1,2 . .2 x k y 2 A 1,2 , 2 1 k . k=2, .3 x y 2 2 .4 2 0 x 1 1 y 2 y ;.5 3 4.5 F Q(E) P B D C A x=1 1 y = 2 y ;.6 x 1 1 y
7、 2 y .7 ( ) 3 9 27 ) 23. (1) BAD= CAE BAD BAC= CAE BAC BAE= CAD .1 BAE CAD AE=AD, BAE= CAD,AB=AC BAE CAD SAS .3 (2) BAE CAD BEA= CDA BE=CD DE=CB BCDE .5 AE=AD AED= ADE BEA= CDA BED= CDE .7 BCDE BE CD CDE+ BED= BCDE .9 24. 1 2 4 .1+1 2 ts = = .3 = = t= t= .4 D E B A C 2 1 D C A A C P P B Q B Q .5 3 y s PQ CD AB=10 .6 ACB , ACD+ BCD PCQ ACB .8 = = y= .9 25. 1 A 2 3 y= k=6 1 2 D 3 m y= m= =2 D 3 2 .2 AD y=kx+b A 2 3 D 3 2 .3 k= 1 b=5 AD y= x+5 .4 3 C N BA y M 5 .6 OB = = 2 .7 C y= =S =3 .8 = S =9 9 .9
