65-67С полными ответами

65
1) = 5х                                 4) = -12nx
2) = 3abm                             5) = 9abc
3) = -24xyz                            6) = -xy

66
1)   = 3(-2)=3(-8)= - 24
2)  = -4,51/9(-4) = -0,516= -8
3) =  7/12(-1/7)(-2) = -1/124= -1/3
4) = 0,4(0,5)6(-10)= 0,16(-10)= -6

67

1) = -36pk                                4) = 0,9abc
2) = 2ab                                   5) = -18xyz
3) = 2,3xy                                 6) = -4,5xyz