\(\frac{9-\left(x+5\right)^2}{x^2+4x+4}\)
Rút gọn
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a) \(=\frac{5x\left(16x^2-25\right)}{\left(x-3\right)\left(4x-5\right)}\)\(\)
\(=\frac{5x\cdot\left(4x-5\right)\left(4x+5\right)}{\left(x-3\right)\left(4x-5\right)}\)
\(=\frac{5x\left(4x+5\right)}{x-3}\)
b) \(=\frac{3^2-\left(x+5\right)^2}{\left(x+2\right)^2}\)
\(=\frac{\left(3-x-5\right)\left(3+x+5\right)}{\left(x+2\right)^2}\)
\(=\frac{\left(x+2\right)\left(8+x\right)}{\left(x+2\right)^2}\)
\(=\frac{8+x}{x+2}\)
\(\frac{x^2-9-\left(4x-2\right)\left(x-3\right)}{x^2-6x+9}\)
\(=\frac{\left(x-3\right)\left(x+3\right)-\left(4x-2\right)\left(x-3\right)}{\left(x-3\right)^2}\)
\(=\frac{\left(x-3\right)\left[\left(x+3\right)-\left(4x-2\right)\right]}{\left(x-3\right)^2}\)
\(=\frac{x+3-4x+2}{x-3}\)
\(=\frac{-3x+5}{x-3}\)
b: \(=\dfrac{1}{\left(x+1\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+2\right)}+\dfrac{1}{\left(x+2\right)\left(x+3\right)}\)
\(=\dfrac{\left(x+2\right)\left(x+3\right)+\left(x+1\right)\left(x+3\right)+\left(x+2\right)\left(x+1\right)}{\left(x+2\right)^2\cdot\left(x+1\right)\left(x+3\right)}\)
\(=\dfrac{x^2+5x+6+x^2+4x+3+x^2+3x+2}{\left(x+2\right)^2\cdot\left(x+1\right)\left(x+3\right)}\)
\(=\dfrac{3x^2+12x+11}{\left(x+2\right)^2\cdot\left(x+1\right)\left(x+3\right)}\)
\(A=\left(\dfrac{1}{x^2-4x}+\dfrac{2}{16-x^2}+\dfrac{4}{4x+16}\right):\dfrac{1}{4x}\left(x\ne4;x\ne-4;x\ne0\right).\)
\(A=\left(\dfrac{1}{x\left(x-4\right)}+\dfrac{-2}{\left(x+4\right)\left(x-4\right)}+\dfrac{1}{x+4}\right).4x\).
\(A=\dfrac{x+4-2x+x^2-4x}{x\left(x-4\right)\left(x+4\right)}.4x.\)
\(A=\dfrac{x^2-5x+4}{\left(x-4\right)\left(x+4\right)}.4.\)
\(A=\dfrac{\left(x-4\right)\left(x-1\right)}{\left(x-4\right)\left(x+4\right)}.4.\)
\(A=\dfrac{4\left(x-1\right)}{x+4}.\)