5 / 9 × (79 + 6 / 7)+ 50 × 1 / 9 + 11 / 9 × 5 / 17
= 5 / 9 × (79 + 6 / 7)+ 10 × 5 / 9 + 5 / 9 × 11 / 17
= 5 / 9 × (79 + 6 / 7 + 10 + 11 / 17)
= 5 / 9 × (89 + 1)
= 5 / 9 × 90
= 5 × 10
= 50
5 / 9 × (79 + 6 / 7)+ 50 × 1 / 9 + 11 / 9 × 5 / 17
= 5 / 9 × (79 + 6 / 7)+ 10 × 5 / 9 + 5 / 9 × 11 / 17
= 5 / 9 × (79 + 6 / 7 + 10 + 11 / 17)
= 5 / 9 × (89 + 1)
= 5 / 9 × 90
= 5 × 10
= 50