Вычислите: 2,25 * (9 11/18 - 7,5) - 8 1/3 : 3 1/3 = ?

Question

Вычислите: 2,25 * (9 11/18 - 7,5) - 8 1/3 : 3 1/3 = ?

Answer 1

2,25×(9 11/18 - 7,5) - 8 1/3 ÷ 3 1/3 ;

1) 9 11/18 - 7 1/2 = 173/18 - 15/2 = 173/18 - 135/18 = 38/18 = 19/9

2) 19/9 × 2 1/4 = 19/9 × 9/2 = 19/2

3) 8 1/3 ÷ 3 1/3 = 25/3 × 3/10 = 5/2 = 2,5

4) 19/2 - 2 1/2 = 19/2 - 5/2 = 14/2 = 7