1) (y+5)^3-25(y+1)^2-y(5-y)^2 =y³+15y²+75y+125-25y²-50y-25-25y+10y²-y³=
=100
<span>2) 5(1-b)^3-1(1-5b)^2+5b(b+1)^2=5-15b+15b</span>²-5b³-1+10b-25b²+5b³+10b²+5b=
=4
14*100-90=1310
A1 = - 6
a2 = - 3
d = a2 - a1 = - 3 + 6 = 3
a10 = a1 + 9d = - 6 + 3*9 = 21
S10 - ?
S10 = (a1 + a10)/2*10 = 5* ( - 6 + 21) = 15*5 = 75
<span>2а - 3б
</span><span>3 < а < 4 => 2*3-3*8=-18 => 2*3-3*9=-21
8 < б < 9 => 2*4-3*9=-19 => 2*4-3*8=-16
-21<2a-3b<-16</span>