1 90 100 ( , , 3 , 0 30 ) 1 2 3 4 5 6 7 8 9 10 ( 10 3 30 ) 1 m 1 A 6m 6 B 5m 5 C m+1 0 D 1 m 2 2. , ( ) A. 16= 4 B. 16=4 C.327 =-3 D.2( 4) =-4 3 a b 0 A b xa x B b xa x C b xa x D b xa x 4 (A) 50 40 (B) 50 40 (C) 50 130 (D) 50 50 5 12xy A.135xyxy B.135xyxy C.331xyxy D.2335xyxy 6 ABC ABC=500 ACB=800 BP ABC CP ACB BPC A 1000 B 1100 C 1150 D 1200 PCBA (1) (2) (3) 7 3 4 5 7 A 4 B 3 C 2 D 1 8 12 A 5 B 6 C 7 D 8 9 A1B1C1 ABC BC BC ABC 20 cm2 A1DCC1 A 10 cm2 B 12 cm2 C 15 cm2 D 17 cm2 10. , 1, , (0,0)
