Question

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Bài 3:

a) \(\frac{x}{2xy - y^2} + \frac{y^2 - 2x}{xy - y^2}\)

b) \(\frac{-3x^2}{x+1} + \frac{3}{x+1}\)

Answer 1

a, `\frac{x}{xy-y^2}+\frac{y^2-2x}{xy-y^2}`

`=\frac{x+y^2-2x}{xy-y^2}`

`=\frac{y^2-x}{xy-y^2}`

b, `\frac{-3x^2}{x+1}+\frac{3}{x+1}`

`=\frac{-3x^2+3}{x+1}`

`=\frac{-3(x^2-1)}{x+1}`

`=\frac{-3(x-1)(x+1)}{x+1}`

`=-3(x-1)`