1、 2014 8 3 24 1 3 2014 3 A 3 B 3 C D . 3 3 3 3 B “ ” 0 0 2 3 2014 A B C D . 2 3 A 3 3 2014 2013 2013 29000 29000 A 2.910 3B 2.910 4C 2910 3D 0.2910 5 . a10 n 1 |a| 10 n n a n 1 n 1 n 29000 2.910 4 B a10 n 1 |a| 10 n a n 4 3 2014 2 3 1 A 1 3 B 2 2 C 2 4 D 3 3 - . 2 3 1 2 4 C 5 3 2014 A a+a 2 =a 3B 3a
2、2 =6a 2C a 6 a 2 =a 3D a 2 a 3 =a 5 . A a a 2 B 3a 2 =9a 2 C a 6 a 2 =a 6 2 =a 4 D a 2 a 3 =a 2+3 =a 5 D 6 3 2014 A x 2 B x 2 C x 3 D x 3 . x 3 x 2 x 3 C x x 7 3 2014 1 1 1 1 1 A B C D . 6 1 A = 8 3 2014 4cm 3cm A 12cm 2B 15cm 2C 20cm 2D 30cm 2 . 4cm 3cm =5cm =6 =6 5=15 cm 2 B 8 3 24 9 3 2014 x 2 4=
3、 x+2 x 2 - . x 2 4= x+2 x 2 10 3 2014 y= x 1 2 +3 3 . 1 3 a 0 3 x 1 2 0 x=1 y= x 1 2 +3 y 3 3 11 3 2014 a=9 a 2 +2a+1 100 - . a 2 +2a+1= a+1 2 a=9 = 9+1 2 =100 100 12 3 2014 ABC D E AB AC BC=4cm DE= 2 cm . DE=BC D E ABC AB AC DE ABC DE=BC BC=4cm DE=2cm 2 13 3 2014 ABCD AC BD O BCO=55 ADO= 35 . AC BD
4、 AD B CBO ADO ABCD AC BD BOC=90 BCO=55 CBO=90 55 =35 ABCD AD BC ADO= CBO=35 35 14 3 2014 A 41m BC A C B 35 A BC 59 m 1m sin35 0.6 cos350.8 tan35 0.7 - . B 35 BC=41m tan BAC= A BC AC Rt ABC BAC=35 BC=41m tan BAC= AC= = 59 m 59 15 3 2014 13 14 15 16 1 2 5 4 15 . 13+142+155+164 12=15 15 15 16 3 2014 A
5、x 1 y 1 B x 2 y 2 y= y 1 +y 2 0 x 1 +x 2 0 . A x 1 y 1 B x 2 y 2 y= y 1 y 2 x 1 x 2 y 1 +y 2 0 A x 1 y 1 B x 2 y 2 y= y 1 y 2 0 y 1 = y 2 = x 1 = x 2 = x 1 +x 2 = = y 1 +y 2 0 y 1 y 2 0 0 x 1 +x 2 0 0 4 17.18.19 9 20 12 39 17 9 2014 1 + + 1 . = 3+2 +3=3 18 9 2014 = +1 . x 6=x+2x+2 3x=4 x= x= “ ” 19
6、9 2014 A B C D AB=CD AE BF CE DF AE=BF . A= FBD D= ACE AC=BD “ ” ACE BDF AE BF A= FBD CE DF D= ACE AB=C D AB+BC=CD+BC AC=BD ACE BDF ACE BDF ASA AE=BF 20 12 2014 12 x A 4x 8 a B 8x 12 6 C 12x 16 9 D 16x 20 8 E 20x 24 4 1 12 8 12 12 6 20 % 30 2 a= 3 12 12x 16 3 12 16 . 1 8 12 12 2 a 3 1 12 8 12 12 6 2
7、0% 620%=30 2 a=30 6 9 8 4=3 12 12 x 16 3 16 100%=40% 3 21.22 9 23 10 28 21 9 2014 2013 100 2015 121 2013 2015 1 2013 2015 2 2014 . 1 = 1+ x 100 1+x 100 1+x 2 4 2 2014 100 1+x 1 2013 2015 x 100 1+x 2 =121 x 1 =0.1=10% x 2 = 2.1 2013 2015 10% 2 2014 100 1+0.1 =110 2014 110 22 9 2014 8 280 y 1 y 2 x 1 a= 8 b= 280 2 . 1 2 1 a=8 b=280 8 280 2 2808=35 / 400 24 8 =25 / 400 280 35+25 =2 2 352=70
