Ответы и объяснения

2012-10-07T11:37:55+04:00

2(с-3)-5(2-4с) = 2с-6-10+20с = -16+22с = 2(11с-8)

 

-(9-2х)+4х = -9+2х+4х = 6х-9 = 3(2х-3)

 

-4+4(5-х) = -4+20-4х = 20-8х = 4(5-4х)

 

-2(х+5)+3(х-7) = -2х-10+3х-21 = х-21

 

-13-3(5-6х) = -13-15+18х = 18х-28 = 2(9х-14)