(X^2+3)/(X-4)+(X^2-X)/(X-4)=0
(2X^2+3-X)/(X-4)=0
X1+X2=1/2
lg(x² - x) = lgx
ОДЗ: x > 0, x² - x > 0 => x(x - 1) > 0 => x > 1
x² - x = x
x² - 2x = 0
x(x - 2) = 0
x₁ = 0 - не подходит, т. к. x > 0
x₂ - 2 = 0 => x₂ = 2
Ответ: x = 2
F=pgl^3
l^3=F/pg
l^3=17280/10*1000=1.728
<span>l=1.2</span>