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
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