1、 2018 6 3 18 1 x A ax 2 +bx+c=0 B x 2 -2=(x+3) 2C 2 3 50 x x D x 2 -1=0 2 2 -3 A x 2 -6x+8=0 B x 2 +2x-3=0 C x 2 -x-6=0 D x 2 +x-6=0 3 x=-2 A y=(x+2) 2B y=2x 2 -2 C y=-2x 2 -2 D y=2(x-2) 24 y=x 2 -6x+5 2 1 A y=(x-4) 2 -6 B y= x-4 2 -2 C y=(x-2) 2 -2 D y=(x-1) 2 -3 5 y=ax 2 +bx+c x -3 -2 -1 0 1 2 3 4
2、 5 y 12 5 0 -3 -4 -3 0 5 12 y 0 x A x 0 x 2 B 0 x 2 C x -1 x 3 D -1 x 3 6 y=ax 2 +bx+c a 0 x=-1 abc 0 2a+b=0 a-b+c 0 4a-2b+c 0 A B C D 6 11 6 3 18 7 x(x+2)=-7x . 8 m+3 x |m|-1 +3mx=0 x m . 9 n(n 0) x x 2 +mx+2n=0 m+n= . 10 y=x 2 +(m-1)x+1 x 1 y x m . 11 , , 2 1 2 yx 2 1 2 2 y x x , . 12 2 1 () 3 y x
3、 m y E l 3 3 3 yx F EF x . 5 6 30 13 1 x-3 2 = 2x+5 2 2 x-1 x+4 =4 14 1 x m-1 x 2 +x+1=0 m . 15 C 2 3 x A B A B x 2 -4x+3=0 . 16 ABC AB=BC=8cm P A AB B P PR BC PQ AC AP PQCR 16cm 2 17 (a) (b) , 8 8 , 1, (a) (b) , : . (1) AB , ABCD, 12; (2) EF , EFP, 15 2 . 3 8 24 18 x x 2 -2(m+1)x+m(m+2)=0. 1 m 2 m=
4、2 2 -5 + . 19 2014 1280 2016 2880 . 1 2014 2016 2 2016 500 1000 1000 8 1000 5 400 20 M 0 y -M y M M . 1. 1 y=x+1 -4 x 2 2 y=-x+1 a x b b a 2 2 b 2 9 18 21 y x y=ax 2 +bx 75 1 a b . 2 3 16 22 1 ABCD E BC ABE AE AFE F ABCD AF CD G FC GFC GCF 2 1 ABCD 1 AGD=120 FCG= . 12 23 y=x 2 2x+k x A B y C(0 3) (1) k A B (2) x D ABDC D (3) y=x 2 2x+k Q BCQ BC
