1、 2017 ( ) 12 3 36 . 3 0 1 A a 3 a 2 =a 6B a 3 a=a 3C a 2 +a 2 =a 4D a 2 2 =a 4 48 35 46 47 A =a 5 A B =a 2 B C =2a 2 C D 2 A B C D U1 D 3 1000 1000 A 1 10 3B 1000 10 8C 1 10 11D 1 10 14 1I a 10 n 1 |a| 10 n n a n 1 n 1 n 1000 1 10 11 C 4 1 0 0 1 4 A 2 1 B 1 1 C 1 2 D 1 2 P6 D3 x y 1 0 x 0 1 y 1 1 B
2、5 A B C B C D C E F D A B 25 29 = 2 1 A 6 AB DE A + B C D + JA C CF AB 1= C CF AB AB DE AB CF DE 1= 1+ 2= + B 7 10 9 8 1 1 A B C D W7 VD W2 = =9 = 1+1+1=1=0.4 = =8.2 C 8 y=ax+b y= ab 0 a b A B C D G2 F3 a b ab 0 a b A a 0 y b 0 ab 0 a b 0 y= B a 0 y b 0 ab 0 a b 0 y= C a 0 y b 0 ab 0 a b 0 y= D a 0
3、y b 0 ab 0 C 9 x A x 1 B x 2 C x 1 D x 2 72 x x 2 B 10 ABCD O AB DC G AO CD E BD DBC A B C D M6 GBC= DBC=2 A B D C GBC= AE CD AE O M AO CD DBC=2 C 11 x x 1.8=1 1.4= 2 3= 3 y=x x= x 2 #N A 0 B 0 2 C 1 D A8 2A E6 1 x 2 x 2 =1 1 x 0 x 2 =0 2 x 1 x 2 = 1 x 1 x 2 x 2 =1 x 1 = x 2 = 1 x 0 x 2 =0 x 1 =x 2
4、=0 2 x 1 x 2 = 1 x= x 2 0 12 A C 3 B BA BC ABCD D A 2 B 2 C 2 D 2 M4 L8 B AC AO E BD= 2 3=2 BD= 2 3=4 OD=1 OE=2 DE=1 OD B AC AO E B BD AC D BD= 2 3=2 OD=OB BD=1 ABCD DE= BD=1 OE=2 OD CE= = CD= = BD= 2 3=4 OD=1 OE=1 DE=2 OD CE= = =2 CD= = =2 D 6 3 18 3 13 1 = x+1 6C 1 = = =x+1 x+1 14 x 2 2x+ x 2 = x+
5、1 x 2 53 =x x 2 + x 2 = x+1 x 2 x+1 x 2 15 ABC AB AC D E AB AC AC=3AD AB=3AE F BC DF AC BFD= A FDB ADE S8 DF AC BFD= A DF AC BFD= A A= A = = ADE ACB DF AC BDF BAC BDF EAD BFD= A B= AED FBD AED DF AC BFD= A 16 x kx 2 2x+1=0 k k 1 k 0 AA k 0 x kx 2 2x+1=0 =b 2 4ac 0 4 4k 0 k 1 x kx 2 2x+1=0 k 0 k 1 k
6、0 17 1 1 6 6 2 2 11 10 3 3 16 14 n 9n+3 38 1 1 6 6 =6+6=12=9+3 2 11 10 =11+10=21=9 2+3 3 16 14 =16+14=30=9 3+3 n =9n+3 9n+3 18 ABCD BC AD B AD CE CD D CG BE= BC ABCD 15 PB LB BC AB BE=a BC=3a CD 2 CD=3a 2 AE=3a 2 a=2a 2 = =2 2 2 +AE 2 2 a= a= a= BC=2 a= a= BC=5 AB=CD=3a 2=3 ABCD 5 3=15 15 7 66 . 19
7、1000 1 2 600 3 1000 A B C X6 V5 VB VC 1 2 3 1 16 40%=40 40 12 16 2=10 10 40=25% 12 40=30% 2 25%+5%=30% 600 600 30%=180 3 9 3 P= = 20 CD 2.5 1.5 A D B E AB=14 0.1 1.73 TA x MC AB x 1.5=1 +1 +1 Rt = 5x+1 Rt = 4x+1 4x+1 5x+1 =14 x 3.17 5 3.17+2.5 18.4 21 100 4000 / 1000 / 16 1 2 400 1000 FH 9A 1 x y 2
8、m w m 3 m 75 w=1000m+400=600m+40000 1 x y 20 80 2 m w m 3 m 75 w=1000m+400=600m+40000 600 0 w m m=75 w 85000 22 AB O AC O D DE AC AB F DA 1 EF O 2 DA=DF=6 ME MO 1 OD EF 2 S ACD =S COD S =S AED S COD 1 OD D CAD= BAD OA=OD BAD= ADO CAD= ADO DE AC CAD+ ADO+ OD EF EF O 2 OC CD DA=DF BAD= F BAD= F= CAD BAD+ CAD+ OC=OA AOC OD EF Rt ODF DF=6 Rt AED DA=6 AOC CD AB S ACD =S COD S =S AED S COD = 9 3 6 2 = 23 10dm 6dm 1 12dm 2 2 0.5 2 HE
