Найдите значение выражение : 4х-5 1/3у + 61/8: z-17 1/2, если х=5/9; у= 3/16; z = 7/20

1) 4x - 5 1/3y 
4 * 5/9 - 16/3 * 3/16 = 20/9 - 1 = 2 2/9 - 1 = 1 2/9 

2) 61/8 : z 
61/8 : 7/20 = 305/14 = 21 11/14 

1 2/9 + 21 11/14 - 17 1/2 = 1 2/9 + 21 11/14 - 17 7/14 = 1 2/9 + 4 4/14 =
= 1 2/9 + 4 2/7 = 1 14/63 + 4 18/63 = 5 32/63