У+17/4< 3(10 +у)/5
у+17(*5)/4<30+у(*4)/5
5у+85/20<120+4у/20
5у+85<120+4у
5у-4у<-85+120
у<35
Lg (x^2) = 2*lg(x)
lg (x^3) = 3*lg(x)
... lg (x^19) = 19*lg(x)
lg(x) * (<u>1</u>+2<u>+3</u>+4<u>+5</u>+6<u>+7</u>+8<u>+9</u>+10<u>+11</u>+12<u>+13</u>+14<u>+15</u>+16<u>+17</u>+18<u>+19</u>) = 380
lg(x) * (9*20+10) = 380
lg(x) = 380 / 190 = 2
x = 10^2 = 100
Вот так он должен выглядеть
<span>2+3(y-1/3)-2(0.5y)</span>
<span>2+3(y-1/3)-2(0.5y)</span>
<span>2+3y-1-y</span>
<span>1+2y</span>
<span>
</span>