For :

\(A=\dfrac{1}{\left(x+y\right)^3}\left(\dfrac{1}{x^4}-\dfrac{1}{y^4}\right)\)

\(B=\dfrac{2}{\left(x+y\right)^4}\left(\dfrac{1}{x^3}-\dfrac{1}{y^3}\right)\)

\(C=\dfrac{2}{\left(x+y\right)^5}\left(\dfrac{1}{x^2}-\dfrac{1}{y^2}\right)\)

Required feature : A + B + C

Shorten the following :

\(\dfrac{\left(x^2+a\right)\left(1+a\right)+a^2x^2+1}{\left(x^2-a\right)\left(1-a\right)+a^2x^2+1}\)

Prove that the above dependence does not depend on x, which means for every x and a .

A trapezoid shape with a height of half the total of two bottoms. Calculate angles created by two diagonal lines .

Cho a , b , c thuộc R và a + b + c = 9 .

Tìm GTNN của \(p=\sqrt{a^2+ab+b^2}+\sqrt{b^2+bc+c^2}+\sqrt{c^2+ca+a^2}\)