Odpowiedź :
Odpowiedź:
[tex]a)\ \ 9+(2-6a)=9+2-6a=11-6a=-6a+11\\\\b)\ \ -(6b+1)=-6b-1\\\\c)\ \ (9+f)-(3f-4)=9+f-3f+4=-2f+13[/tex]
a)
[tex]9 + (2 - 6a) = 9 + 2 - 6a = 11 - 6a = -6a + 11[/tex]
b)
[tex] -(6b + 1) = - 6b - 1[/tex]
c)
[tex](9 + f) - (3f - 4) = 9 + f - 3f + 4 = 13 - 2f = - 2f + 13[/tex]