[tex] \frac{a^2-b^2}{b(a+b)}+ \frac{b}{(a+b)}= \frac{a^2-b^2+b^2}{b(a+b)}= \frac{a^2}{b(a+b)} \\ \frac{( \sqrt{3})^2}{ \sqrt{27}( \sqrt{3}+ \sqrt{27})}= \frac{3}{3 \sqrt{3}*( \sqrt{3}+3 \sqrt{3})}= \frac{1}{12} [/tex]
[tex] \left \{ {{5x \geq -5} \atop {2x<3}} \right. \\ \left \{ {{x \geq -1} \atop {x<1.5}} \right. [/tex]
[-1;1.5)
