56. 1. -29*7/9 + 7/9*(-25)= 7/9*(-29-25) (по свойству)=
7/9*(-54)= 7*(-54/9)= -42
2. 217*33-41*217+8*417= 217*(33-41)+8*217+8*200=
217*(33-41+8)+8*200= 217*0+200*8= 1600
3. -2 1/9* 3 2/21 + 3 2/21*(-11 8/9) -14*(-2 1/42)=
65/21(-19/9-107/9)- 14(-85/42)= 65/21(-126/9)-14(-85/42)=
14*65/21-14*(-85/42)=14*(130/42-(-85/42))=14*215/42=213 2/3
62. 5/(-0.2)+(108*(-35))/(-12*(30-4*25)=
-25+(-9*(-35)/(-70))=-25-9/2=20.5
