А)270/ 500 : 54/60. б) (-3/4) *(-4/20/27) : 9/16

А) 270/ 500 : 54/60 = 270/500 * 60/54 = (270 * 60)/(500 * 54) = (27 * 6)/(5 * 54) =(1 * 6)/(5 * 2) =(1 * 3)/(5 * 1) = 3/5 Ответ: 3/5; б)(-3/4) * (-4/20/27) : 9/16 = (-3/4) * (-4/20 * 1/27) : 9/16 = (-3/4) * (-4/20 * 1/27) * 16/9 = (3 * 4 * 1 * 16)/(4 * 20 * 27 * 9) = (1 * 1 * 1 * 4)/(1 * 5 * 27 * 3) = 4/405. Ответ: 4/405