Ответ:

Пошаговое объяснение:

5 3/4 ·3 5/7 +3 5/7 ·1 1/4=3 5/7· (5 3/4 +1 1/4)=26/7 ·7=26

15 3/8 ·4 1/6 -4 1/6 ·15 3/8=0

((3 1/3 +5 7/9)·2 1/4 -1 1/15 ·(3 5/6 -7/12 +9 7/8))·16/39=((3 3/9 +5 7/9) ·9/4 -16/15 ·(3 10/12 -7/12 +9 7/8))·16/39=(82/9 ·9/4 -16/15 ·(3 6/24 +9 21/24))·16/39=(41/2 -16/15 ·12 27/24)·16/39=(41/2 -16/15 ·315/24)·16/39=(41/2 -2·21/3)·16/39=(20,5-2·7)·16/39=6,5·16/39=13/2 ·16/39=8/3=2 2/3

(20 8/15 ·7 1/2 -54 3/5 ·2/5)÷(3 13/21 ·8 2/8 -29 2/5) -5/6 ·1 1/5 +21/25=(308/15  ·15/2 -273/5 ·2/5)÷(76/21 ·33/4 -29 2/5) -5/6·6/5 +21/25=(154 -546/25)÷(19·11/7 -29 14/35) -25/25 +21/25=(154-21,84)÷(29 30/35 -29 14/35) -4/25=3304/25 ·35/16 -4/25=413·7/(5·2) -4/25=289,1-0,16=288,94