Question

Помогитеее нужно сросно :3
Номер 56, 60, 62

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Answer 1

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