ответ: 15. 17 4/7.
Пошаговое объяснение:
5 1/3 × 2 1/4 : 4/5= 16/3 * 9/4 : 4/5 = 16*9/3*4 * 5/4 = 15.
( 2 1/2+1 1/3) : 1/6 - 5 3/7= ((2+1) ( 3/6+2/6)) : 1/6 - 5 3/7 = 3 5/6 : 1/6 - 5 3/7 =
=23/6 : 1/6 * 5 3/7 = 23/6 * 6 - 5 3/7 = 23 - 5 3/7 = 17 (7/7 - 3/7)=17 4/7.
