làm tính chia
\(\dfrac{4a^{2^{ }}-9b^2}{a^2b^2}:\dfrac{2ax+3bx}{2ab}\)
\(\dfrac{2x}{25-4b^2}:\dfrac{1}{5+2b}\)
\(\dfrac{\left(2-a\right)^2}{2ab}.\dfrac{b}{\left(2-a\right)}+\dfrac{1}{2}\)
\(\dfrac{2b+2}{2b-b^2}:\dfrac{b+1}{b}+\dfrac{2b+2}{3b-6}\)