2018 2 32 1-5. CBDDA 6-10 BBCCB 11-16 BADAA C 3 12 17. 8 18. -1 19. 208 20. 1 2 n 6 56 21 1 1 2 6 3 x 2 2 6 3 x -4 2 -1+ -5 22 3 9 23. 1 m=90 n=88-2 -4 2 m=90 S 2 = = - -7 3 -9 24. 60 120 8800 60 x -1 x120 0.5 x 60 =8800-4 x1=220 x2=80-6 x1=220 120 220 60 =40 100 x1=220 x2=80 120 80 60 =110 100 x=80-8 80 -9 25. C-1 AB=8 PC=x -4 8+x= -6 x=4 +1 -8 10.92 10 -10 26. t=2 3.5 (1) BC=2cm AB=2BC=2 2=4 -2 BC BD=1 -3 BED BAC BE BD AB BC 41 42 t t=2 -6 (2) BED BCA BE BD BC AB 41 24 t t=3.5 -9 t=2 3.5 B , E ,D ABC -10
