Выполните деление: a) 3/8 : 2/3, b) 4/7 : 4/9, c) 11 2/5 : 3 4/5, d) 16/17 : 8, e) 12 : 6/7.

a) (3/8)/(2/3) = (3*3)/(8*2) = 9/16. b) (4/7)/(4/9) = (4*9)/(7*4) = 9/7. c) (11 2/5)/(3 4/5) = (57/5)/(19/5) = 57/19. d) (16/17)/8 = 16/(17*8) = 16/136 = 2/17. e) 12/(6/7) = (12*7)/6 = 84/6 = 14.