1)\(\dfrac{8xy}{32y}\)=\(\dfrac{x}{4}\)
2)\(\dfrac{4x+10}{2x^2+5x}\)=\(\dfrac{\left(2x+5\right).2}{\left(2x+5\right).x}\)=\(\dfrac{2}{x}\)
3)\(\dfrac{3x-6}{4-x^2}\)=\(\dfrac{\left(x-2\right).3}{\left(2-x\right).\left(2+x\right)}\)=\(\dfrac{-\left(2-x\right).3}{\left(2-x\right).\left(2+x\right)}\)=\(\dfrac{-3}{2+x}\)