Thiếu đề rồi bạn

\(\dfrac{x}{x^2-9}+\dfrac{2}{x^2+6x+9}=\dfrac{x\left(x+3\right)+2\left(x-3\right)}{\left(x-3\right)\left(x+3\right)^2}\\ =\dfrac{x^2+5x-6}{\left(x-3\right)\left(x+3\right)^2}=\dfrac{\left(x-1\right)\left(x+6\right)}{\left(x-3\right)\left(x+3\right)^2}\)

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x^2-9\right)=27\\ x.x^2-x.3x+x.9-x.x^2+x.9=27\\ x^3-3x^2+9x-x^3+9x=27\\ 3x^2+18x=27\\ 21x^2=27\\ x^2=\dfrac{9}{7}\\ \Rightarrow x=\sqrt{\dfrac{9}{7}}\)

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x^2-9\right)=27\\ x.x^2-x.3x+x.9+3.x^2-3.3x+3.9-x.x^2+x.9=27\\ x^3-3x^2+9x+3x^2-9x+27-x^3+9x=27\\ 9x+27=27\\ 9x=0\\ x=0\)

minh@@22@22222@@@@? 

\(1.x-\dfrac{2}{3}\times\left(x+9\right)=1\)

\(x-\dfrac{2}{3}\times x-6=1\)

\(x\times\left(1-\dfrac{2}{3}\right)=7\)

\(x\times\dfrac{1}{3}=7\)

\(x=21\)

\(2.x-\dfrac{11}{15}=\dfrac{3+x}{5}\)

\(\dfrac{15x}{15}-\dfrac{11}{15}=\dfrac{9+3x}{15}\)

\(15x-11=9+3x\)

\(12x=20\)

\(x=\dfrac{5}{3}\)

giải giúp mk vs ạ

bn ơi mk rất mún giải hộ pạn nhưng mk k bít để giải xin lỗi pạn nhìu

k mk nhé

ahihu tk k ai pít giải à 

   (x + 3)(x² - 3x + 9) - x(x - 2)² = 27

\(\Leftrightarrow\) x³ + 27 - x( x² - 4x + 4) = 27

\(\Leftrightarrow\) x³ + 27 - x³ + 4x² - 4x - 27 = 0

\(\Leftrightarrow\) 4x² - 4x = 0

\(\Leftrightarrow\) 4x ( x - 1) = 0

khi 4x = 0 hoặc x - 1 = 0

\(\Leftrightarrow\)  x = 0        \(\Leftrightarrow\) x = 1

 Chúc bạn học tốt

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x-2\right)^2=27\\ x.x^2-x.3x+x.9+3.x^2-3.3x+3.9-x.x^2+x.2^2=27\\ x^3-3x^2+9x+3x^2-9x+27-x^3+4x=27\\ 4x+27=27\\ 4x=0\\ x=0\)

\(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x^2-2\right)=15\)

\(\Leftrightarrow x^3+27-x^3+2x=15\)

\(\Leftrightarrow2x=-12\)

\(\Leftrightarrow x=-6\)

\(\left(x^3+3^3\right)-x\left(x^2-4\right)=15\)

\(x^3+27-x^3+4x=15\)

\(4x=15-27\)

\(4x=-12\)

\(x=-3\)

(x+3)(x²-3x+9)-x(x-2)(x+2)=15

=>x³+27-4x-x³=15

=>(x³-x³)+4x+27=15

=>4x+27=15

=>4x=-12

=>x=-3.Vậy x=-3

\(\Leftrightarrow2x^2=450\)

hay \(x\in\left\{15;-15\right\}\)