15 7/9-(4 7/9+2 1/3)=

Question

15 7/9-(4 7/9+2 1/3)=

Answer 1

15 7/9-4 7/9-2 1/3=11-2 1/3=8 2/3

Answer 2

1)4 7/9  +  2 1/3 = 43/9 + 7/3 =(43 × 1 +7 × 3)/9 = 43/9  +  21/9 =  64/9 = 7 1/9
2) 15 7/9 - 7 1/9 = 142/9  -  64/9 = 78/9 = 26/3 = 8 2/3
ответ 8 2/3