-(6,77-5/4/9)-(0,23-3/5/9). -15,26-(-34,35)-24,62-(-4,73)+(-81,77)

1). (6,77-5/4/9)-(0,23-3/5/9)

(677/100-45/4)-(23/100-27/5)

4*(-112/25)-(-517/100)

(-448+517)/100=69/100

2). 15,26-(-34,35)-24,62-(-4,73)+(-81,77)

15,26+34,35-24,62+4,73-81,77

54,34-106,39

-52,05