... + 2i + 3i + 4i + + 20 17i 20 17 = 1009 + ( 4i + 8i + + 20 16i 20 16 ) + ( i + 5i + 9i + + 20 17i 20 17 ) + + ( 2i + 6i + 10i10 + 20 14i 20 14 ) + ( 3i + 7i + 11i11 + + 20 15i 20 15 ) 504 505 504 504 ... trỡnh ca elip l x2 y2 + = 1, a > b > 0,a2 = b2 + c2 a b ( ) T (*) ta cú: 2a = 10 a = AB = 2c = 2c c = ị b2 = a2 - c2 = Vy qu tớch cỏc im M l elip: ( E ) : x2 y2 + = 25 Cõu 23 : ỏp ỏn A 4 ( ) ... 7-C 8-C 9-C 10-A 11-D 12- C 13-D 14-B 15-D 16-A 17-C 18-D 19-A 20 -B 21 -C 22 -D 23 -A 24 -A 25 -C 26 -D 27 -B 28 -C 29 -B 30-C 31-A 32- A 33-B 34-D 35-B 36-D 37-A 38-C 39-A 40-C 41-C 42- C 43-D 44-B 45-B 46-D...