А) (A - 5)/8 0
A - 5 = 0
A = 5
б)(A-5)/8 =1 => A = 13
в)(A-5)/8>1 => A > 13
г)(A-5)/8<1 => A < 13
F(39)=f(8*5-1)=f(-1)=-f(1)=-3
f(-27)=f(-6*5+3)=f(3)=-4
<span> f(39)+3 f(-27)=-3+3*(-4)=-3-12=-15</span>
#7
3,1×8,2+12,5×4,8+3,1×4,3-12,5×6,7=25,42+60+13,33-83,75=98,75-83,75=15
X+56=23(x-4) скобки раскроем
x+56=23x-92
-22x=-148
x=148/22=6цел 16/22