<span>{5у-2х=2
{х-3у=1
</span>
<span>{5у-2х=2
{х=1+3y
</span>
<span><span>{5у-2·(1+3у)=2
{х=1+3y</span>
</span>
<span><span>{5у-2-6у=2
{х=1+3y</span>
</span>
<span><span>{у=-4
{х=1+3·(-4)
О т в е т. (-11;-4)
</span>
{у + 5х=-9
{3у-5х=-7
</span>
<span>{у =-5x-9
{3·(-5x-9)-5х=-7
</span>
<span>{у =-5x-9
{-15x-27-5х=-7
</span>
<span>{у =-5x-9
{-20x=20
{y=-5·(-1)-9
{x=-1
</span>
О т в е т. (-1;-4)
Решение подробное во вложении......
<span>3x²-48=0
x</span>²=16
x=-4
x=4
B1•q^3=80/3
-90•q^3=80/3
q^3=-80/(3•90)
q^3=-8/27
q=-2/3
b1 -90. -90
S = ---- = --------- = ----- = (90•3)/5 = 54
q–1 -2/3–1 -5/3
Y'=3*cos(3x) - первая производная
вторая производная y''=-9sin(3*x)=-9*0=0