Question

Rút gọn các phân thức sau : Giúp mình nha 

Answer 1

16: \(=\dfrac{5\left(x^2+2xy+y^2\right)}{3\left(x-y\right)\left(x+y\right)}=\dfrac{5\left(x+y\right)^2}{3\left(x-y\right)\left(x+y\right)}\)

\(=\dfrac{5x+5y}{3x-3y}\)

17: \(=\dfrac{x\left(x^2-6x+9\right)}{\left(x-3\right)\left(x+3\right)}=\dfrac{x\left(x-3\right)^2}{\left(x-3\right)\left(x+3\right)}=\dfrac{x^2-3x}{x+3}\)

18: \(=\dfrac{\left(x-3\right)^2}{\left(x-3\right)\left(x+3\right)}=\dfrac{x-3}{x+3}\)

19: \(=\dfrac{\left(2x-1\right)^2}{\left(2x-1\right)\left(2x+1\right)}=\dfrac{2x-1}{2x+1}\)

20: \(=\dfrac{\left(2x-1\right)^2}{3y\cdot\left(2x-1\right)}=\dfrac{2x-1}{3y}\)

Answer 2