54/7÷1 5/21-(5 2/15×3/22+14/15)+7/12×15/17 по действиям

5 4/7 : 1 5/21 - (5 2/15 * 3/22 + 14/15) + 7/12 * 15/17 = 3 389/1020

1) 5 4/7 : 1 5/21 = 39/7 : 26/21 = 39/7 * 21/26 = 9/2 = 4,5

2) 5 2/15 * 3/22 = 77/15 * 3/22 = 7/10 = 0,7

3) 7/10 + 14/15 = 21/30 + 28/30 = 49/30 = 1 19/30

4) 7/12 * 15/17 = 35/68

5) 9/2 - 1 19/30 = 135/30 - 49/30 = 86/30 = 2 13/15

6) 2 13/15 + 35/68 = 43/15 + 35/68 = 2924/1020 + 525/1020 = 3449/1020 = 3 389/1020

ответ: 3 389/1020