найдите значение выражения:
дроби
9\10*5\8*4\15= ?

4\9 : 7\10 : 8\3

9/10 * 5/8 * 4/15 = 9/2 * 1/8 * 4/15 = 9/1* 1/2* 1/15 = 3/1* 1/2 * 1/5 = 3/10 = 0,34/9 :7/10 : 8/3 = 4/9 * 10/7 *3/8 = 1/9 * 10/7 * 3/2 = 1/3 * 10/7 * 1/2 = 1/3 * 5/7 * 1/1 = 5/21