9/25×2целых1/7×1целая5/ (9-2целых2/3×2целых1/7)×21/

= 9/25 * 15/7 * 14/9 = (9*15*14) / (25*7*9) = 6/5 = 1  1/5

= (9 - 8/3 * 15/7) * 21/46 = (9 - 40/7)*21/46 = (9-5  5/7)*21/46 =
= 3  2/7 * 21/46 = 23/7 * 21/46 = 3/2 = 1  1/2