10/x^2-100+x-20/x^2+10x-5/x^2-10x=0

ответ:

x = 15

объяснение:

[tex]\frac{10}{(x-10)(x+10)} + \frac{x-20}{x(x+10)} - \frac{5}{x(x-10)} = + (x - 20)(x - 10) - 5*(x + 10) = 0\\10x + x^2 - 30x + 200 - 5x - 50 = 0\\x^2 - 25x + 150 = {1} * x_{2} = 150\\x_{1} + x_{2} = 25\\x_{1} = 10, x_{2} = /tex]

10^2 - 100 = 0

ответ : 15

x^2+10x-22=0

d=100-4*1*(-22)=188

x1=-10-sqrt(188)/2

x2=-10+sqrt(188)/2

12cos^2a=12*(1/(1+tg^2a))=12*(1/(1+5))=12/6=2