A 3 2 2a 1 4 0 9 2 7 July 8, 2019 16 32 64 128 ((a + 3) ^ 2)/(2a - 4) * (a ^ 2 - 4)/(3a + 9) A 1 2 3 4 5 6 A-3 2/2a+1 4=0 9/2 7 9.19. 1) 2) (a - 1)/(7a ^ 2 + a - 8) (3a - 2)/(3a ^ 2 + 4a - 4)
