Question

помогите даю 20 баллов ​

Answer 1

Ответ:

1) 1

2) 7/27

Пошаговое объяснение:

1)

(2 1/4 + 3 2/3) : (8 1/2 - 1 2/5) × 1,2 = ((2+3) + ( 1/4 + 2/3)) : (17/2 - 7/5) × 6/5 = (5+ 11/12) : 71/10 × 6/5 = 5 11/12 × 10/71 × 6/5 = 71/12 × 2/71 × 6 = 1/2 × 2 = 1

2)

( 1 9/16 × 3 1/5 + 1 2/3 - 9 : 2 2/5) : (17 7/12 - 6 1/3) = ( 25/16 × 16/5 + 5/3 - 9 : 12/5) : ( 211/12 - 19/3) = ( 5 + 5/3 - 9 × 5/12) : 45/4 = ( 5 + 5/3 - 3 × 5/4 ) × 4/45 = 35/12 × 4/45 = 7/3 × 1/9 = 7/27