giúp mik nha
\(C=\dfrac{2}{x^2-y^2}\sqrt{\dfrac{9\left(x^2+2xy+y^2\right)}{4}}\)
\(C=\dfrac{2}{\left(x-y\right)\left(x+y\right)}\sqrt{\dfrac{9}{4}}.\sqrt{x^2+2xy+y^2}\)
\(C=\dfrac{2}{\left(x-y\right)\left(x+y\right)}.\dfrac{3}{2}.\left(x+y\right)\)
\(C=\dfrac{3\left(x+y\right)}{\left(x-y\right)\left(x+y\right)}=\dfrac{3}{x-y}\)
\(C=\dfrac{2}{x^2-y^2}\sqrt{\dfrac{9\left(x^2+2xy+y^2\right)}{4}}\)
\(C=\dfrac{2}{\left(x-y\right)\left(x+y\right)}\sqrt{\dfrac{9}{4}}.\sqrt{x^2+2xy+y^2}\)
\(C=\dfrac{2}{\left(x-y\right)\left(x+y\right)}.\dfrac{3}{2}.\sqrt{\left(x+y\right)^2}\)
\(C=\dfrac{2}{\left(x-y\right)\left(x+y\right)}.\dfrac{3}{2}.\left(x+y\right)\)
\(C=\dfrac{2.3.\left(x+y\right)}{\left(x-y\right)\left(x+y\right).2}=\dfrac{3}{x-y}\)
Chúc bạn học tốt!!!
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