a: \(=\dfrac{4x^2\cdot5y}{5y^2\cdot6x}=\dfrac{2x}{3}\cdot\dfrac{1}{y}=\dfrac{2x}{3y}\)
b: \(=\dfrac{x^2-2x+1}{x\left(x-1\right)}=\dfrac{x-1}{x}\)
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