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2、a+b a2+ab b2 6 120m 60 2023 word A 120m B 60 m C 60 m D 120 m 7 CD O AB CD E AB 12 BE 3 ACBD A 36 B 24 C 18 D 72 8 y x2+3 A x1 y1 B x2 y2 y1 y2 A 0 x1 x2 B x2 x1 0 C x2 x1 0 0 x1 x2 D 9 A C y x 0 A C AB x CD x B D OA AC OC OC AB E E OC AEC k A 1 B 2 C 3 D 4 10 y ax2+bx+c a b c x 2 1 2 x0 y0 c 0 a 0
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4、1 y1 B x2 y2 C x3 y3 x1 x2 x3 t t 8 72.17 8 x+3 1 x 2 2 x4+18 8 AOB AOB 60 R 3 1 AOB S S 2 AOB O1 OA OB C O1 AOB O1 S1 19 8 ABCD AB 8 BC x 0 x 8 ACB AC ACE AE CD F 1 CEF ADF 2 tan DAF x 2023 word 20 8 20/88 89 90 91 95 96 97 98 99 2 1 a 3 2 1 3 2 1 a 1 a 2 x 80 x 90 90 x 97 97 x 100 m n 3 2 1 97 1 98 21 8 AB O C AB C A B OC 3 D O AC AD DC E BE BD 1 BE O 2 BE 6 cos CDA 2023 word 22 10 x a 1 1 a 2 a 23 10 30/x/40 x 80 y x y x+9 50 1 z x x 2 17.5 x x 24 12 y ax2+bx+c A 2 0 B 4 0 D 0 8 1 E 2 y ax2+bx+c E x P C P C P M N M N M N x x M1 N1 PMM1 NPN1 MN y kx+m k+m 2023 word