1、 2017-2018 30 3 1 A B C 2 D 2 2 0.25 A 24.70 B 25.30 C 24.80 D 25.51 3 0 A 1 B 2 C 3 D 4 4 b a 2 A 2 2 b a B 2 ab C ab 3 D 2 2ba 5 a b A ab B ba C 10a+b D 10b+a 6 A 0 B 0 C 0 1 D 0 1 7 3a n b 2 c 5 n= A 2 B 3 C 4 D 5 8 ab ab 2 +b+1 x 2 +x 3 6 A 2 B 3 C 4 D 5 9 m A B C D 10 x 15 1 18 2 9 2017 A 3 B 4
2、 C 6 D 9 16 2 11 7 12 16000000 16000000 13 2a 2a 1 14 3a 3 b m 6a n b 5 15 |x|=5 |y|=12 x y x+y 16 a 2 3b=5 6b 2a 2 +2017= 17 10 2.2 10 1.3 4 15 18 |a+1|=|b+1| |1 c|=|1 d| a+b+c+d= 64 19 5 0 2.5 3 1 . 20 12 3 1 13+ 5 21 19 2 1 36 ( 8) 8 3 1 4 1 0.5 2 3 2 4 48 21 6 3 1 5m+4m 2n+6n+3m 2 a 2 6a 7 3 a 2
3、 3a+4 22. 12 6 1 5 3a 2 b ab 2 ab 2 +3a 2 b a= b= 2 |x+1|+ y 2 2 =0 2x 2 y 2xy 2 3x 2 y 2 +3x 2 y + 3x 2 y 2 3xy 2 23 6 200 +5 1 7 +11 9 +5 +6 1 2 3 24 7 2km 1.5km 4.5km 1 1 1km A B C 2 3 250m/min 25 8 A B 12 8 M N A B M 2 / N 3 / 1 P P 2 t 10 t 26 8 1+2+3+ +n= 1 2 +2 2 +3 2 + +n 2 1 1 1 1 2 2 2+2 2
4、 2 n n n 2 1 2 +2 2 +3 2 + +n 2 2 n 1 n 1 2 n 3 1 2 +2 2 +3 2 + +n 2 = 1 2 +2 2 +3 2 + +n 2 = 2017-2018 3 1.B 2.C 3.A 4.D 5.D 6.C 7.A 8.B 9.B 10.A 2 11 1 7 12 7 1.6 10 13 1 14 35 3ab 15 -7 -17 16 2007 17 39.5 18 0 19 3 11 3 2.5 0 1 22 5 20 1 =13-5+21-19 2 = 1 36 8 8 =34-24 2 = 11 36 88 =10 = 9 16 3
5、3 = 11 1 ( 7) 23 4 = 11 6 3 13 48 48 48 48 12 7 4 24 = 7 1 6 =-44+56-36+26 = 1 6 =2 21 1 =2m+4n 2m 4n 2 2 = 22 6 7 3 9 12 a a a a = 2 2 3 19 aa 22 1 = 2 2 2 2 15 5 3 a b ab ab a b = 22 12 6 a b ab 11 , 23 ab = 22 1 1 1 1 12 ( ) 6 ( ) ( ) 2 3 2 3 = 4 3 2 1, 2 xy = 2 2 2 2 6x y x y xy =-30 23 1 200-1=199 199 . 2 11- -9 =20 20 . 3 5-1-7+11-9+5+6+200X7=1410 1410 1 24 1 3 2 2- -1 =3km 3km. 3 2+1.5+4.5+1=9km 9000 250 36 min 7 36 . 25 1 4 -4 2 (20 10) (2 3) 2s (20 10) (2 3) 6s t=2 6 10 . 26 ( 1)(2 1) ( 1)(2 1) 2 1, , ,1345 26 n n n n n n n 8
