Verified answer

Пошаговое объяснение:

5/9а * 3/25в = (5/9 * 3/25) * а * в =

(1/3 * 1/5) * а * в = 1/15ав

4/7с * 21/24а * 12/13в =

(4/7 * 21/24 * 12/13) * с * а * в =

(1/1 * 3/6 * 12/13) * с * а * в =

(1/1 * 1/2 * 12/13) * с * а * в =

12/26 * с * а * в = 6/13авс

1/2t * 4/9d * 18/19a =

(1/2 * 4/9 * 18/19) * t * d * a =

(1/1 * 2/9 * 18/19) * t * d * a =

(1/1 * 2/1 * 2/19) * t * d * a =

4/19 * t * d * a = 4/19adt