2017-2018 , 4 40 1 x 1 y 3 A A A 3 1 B 3 1 C 1 3 D 3 1 2 1 2 3 2 A 1 4 B 4 1 C 1 4 D 2 1 3 P 2 3 1 3 A 3 0 B 1 6 C 3 6 D 1 0 4 a0 P a 2 A B C D 5 A 5 y1 B 2 y2 2 4 1 x y y1 y2 A y1 y2 B y1 y2 C y1 y2 6 y = x y= 2x+1 A B C D 7 ) 1 ( ) 2 ( m x m y y x x m A m 2 B my2 y13 y1y2 19 BE AC BEC=90 HBC=180 - BEC- BCE=180 -90 -54 =36 CF AB BFC=90 BCF=180 - BFC- ABC=180 -90 -66 =24 BHC BHC=180 - BCF- EBC=180 -24-36 =120 20 DE AB A= E ABC EDC DC BC ECD ACE E A ABC EDC (AAS) AB=DE DE A B 21 1 60 2 10 2 1 x y 3 140
