Найдите частное: a) 5/4 : 2/15, b) 2/3 : 8/9, c) 61/131 : 32/52, d) 61/125 : 4/5.

a) (5/4)/(2/15) = (5*15)/(4*2) = 75/8. b) (2/3)/(8/9) = (2*9)/(3*8) = 18/24 = 3/4. c) (61/131)/(32/52) = (61*52)/(131*32) = 3172/4192 = 793/1048. d) (61/125)/(4/5) = (61*5)/(125*4) = 305/500 = 61/100.