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DK: \(x\ne0;y\ne0\)
\(\left(\frac{x^2-y^2}{6x^2y^2}\right):\left(\frac{x+y}{3xy}\right)=\left(\frac{\left(x-y\right)\left(x+y\right)}{6x^2y^2}\right).\left(\frac{3xy}{\left(x+y\right)}\right)=\frac{x-y}{2xy}\)
\(\left(\frac{4}{x-4}-\frac{4}{x+4}\right)\times\frac{x^2+8x+16}{32}\)
ĐKXĐ : \(x\ne\pm4\)
\(=\left(\frac{4\left(x+4\right)}{\left(x-4\right)\left(x+4\right)}-\frac{4\left(x-4\right)}{\left(x-4\right)\left(x+4\right)}\right)\times\frac{\left(x+4\right)^2}{32}\)
\(=\left(\frac{4x+16-4x+16}{\left(x-4\right)\left(x+4\right)}\right)\times\frac{\left(x+4\right)^2}{32}\)
\(=\frac{32}{\left(x-4\right)\left(x+4\right)}\times\frac{\left(x+4\right)^2}{32}\)
\(=\frac{x+4}{x-4}\)
\(\left(\frac{4}{x-4}-\frac{4}{x+4}\right).\frac{x^2+8x+16}{32}\)
\(=\left(\frac{4\left(x+4\right)}{\left(x-4\right)\left(x+4\right)}-\frac{4\left(x-4\right)}{\left(x+4\right)\left(x-4\right)}\right).\frac{\left(x+4\right)^2}{32}\)
\(=\frac{4x+16-4x+16}{\left(x-4\right)\left(x+4\right)}.\frac{\left(x+4\right)^2}{32}=\frac{32}{\left(x-4\right)\left(x+4\right)}.\frac{\left(x+4\right)^2}{32}=\frac{x+4}{x-4}\)
a: \(\dfrac{x^2-xy+y^2}{x^2+2xy+y^2}\cdot\dfrac{x^2+3xy+2y^2}{x^2-3xy+2y^2}\)
\(=\dfrac{x^2-xy+y^2}{\left(x+y\right)^2}\cdot\dfrac{\left(x+2y\right)\left(x+y\right)}{\left(x-2y\right)\left(x-y\right)}\)
\(=\dfrac{\left(x^2-xy+y^2\right)\left(x+2y\right)}{\left(x-2y\right)\left(x^2-y^2\right)}\)
b: \(\dfrac{x^2+1}{3x}:\dfrac{x^2+1}{x-1}:\dfrac{x^3-1}{x^2+x}:\dfrac{x^2+2x+1}{x^2+x+1}\)
\(=\dfrac{x-1}{3x}\cdot\dfrac{x\left(x+1\right)}{\left(x-1\right)\left(x^2+x+1\right)}\cdot\dfrac{x^2+x+1}{\left(x+1\right)^2}\)
\(=\dfrac{x\left(x+1\right)}{3x\left(x+1\right)^2}=\dfrac{1}{3\left(x+1\right)}\)
\(=8x^2-3x^2y\)