1 \(=\dfrac{4x^2+7+5x^2-7}{3x^2y}=\dfrac{9x^2}{3x^2y}=\dfrac{3}{y}\)
2: \(=\dfrac{6x+3x+27}{x+3}=\dfrac{9x+27}{x+3}=9\)
3: \(=\dfrac{x^2-10x+25}{x-5}=\dfrac{\left(x-5\right)^2}{x-5}=x-5\)
4: \(=\dfrac{x+y}{xy\left(x+y\right)}=\dfrac{1}{xy}\)
5: \(=\dfrac{2x-6+3x+9+1}{\left(x-3\right)\left(x+3\right)}=\dfrac{5x+4}{\left(x-3\right)\left(x+3\right)}\)
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