1、 2016-2017 ( 3 , 24 ) 1-4 ACBD 5-8 CCAD ( 3 , 30 ) 9 9 10 1 11 153.5( 153 30 ) 12 9 13 20 14 4015 13 3 ( ) 16 10 17 105 18 838 910 ( ) 19 ( 4 , 8 ) 1 =-8 2 =4 5 ( 8) 4 =20+2=22 20 ( 4 , 8 ) 1 = 2 2 2 2 4 5 3 4 x y xy x y xy = 22 x y xy 2 = 22 1 3 5 3 2 2 x x x x = 2 9 3 2 xx 21 ( 5 , 10 ) 1 x=-1 2 y
2、=-1 22 8 ) 10 x 20 y 1 x 2 y .3 = 2 2 2 4 2 5 2 6 xy x xy y x xy = 2 5xy y .6 1 x 2 y = 2 5 ( 1) 2 2 4 .8 23.( 10 ,3+3+2+2) 1 2 9 14 24 8 ) (1) 2x x 38-2x=10-x x=28. .4 2x=2 28=56.5 (2) y 100 56+y+28+y=100 y=8.9 : 56 28 8 100.10 25 8 ) AB b G AB CD. .4 3= 2=180 140 =40 .6 l1 l2 1= 3=40 .8 26 10 4+6
3、) 1 40 . .4 2 OB AOC OD EOC AOC=2 BOC COE=2 COD BOC+ COD= BOD=54 AOE= AOC+ COE AOE=2 BOC+ COD =2 BOD=108 .10 27 12 6+6 ) 1 BF DE AGF= ABC GF BC 1= 3 1+ 3+ BF DE .6 2 BF DE BF AC DE AC 1+ .12 28 12 2+3+3+4 ) 1 t 15+5 t=180 t=9 9 .2 2 2 t=2 AOB= AON+ 160 .5 t 15t 5t=180 t=18 t=18 .8 t AOB=30 15t 15t t=15 21 t=15 21 .12
